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Author
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Topic: 347 Piston/Crankshaft questions?
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*EPIK*
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Member # 7481
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Can anyone give me some info on these parts? I'm looking into running this new (but old stock) Eagle 347 kit, but the part number on the pistons is so old it doesn't come up. Even JE had no info for me LOL. I know they are forged, but does anyone know roughly what the compression ratio will be with edelbrock Performer heads? (60cc combustion chamber)
Also is this a cast crank or is it forged?
[ 2013-10-25, 03:28 PM: Message edited by: *EPIK* ]
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
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Posts: 6966 | From: 916 | Registered: Mar 2007
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*EPIK*
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Member # 7481
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posted
Anybody?
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=91 Notch:12.31@110 **Under Construction**
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Posts: 6966 | From: 916 | Registered: Mar 2007
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Duncan Motors
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Member # 7045
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any info u would need is clearly on the side of the box in your pic. are u asking to have it translated???? lol sorry but the info is clearly right there buddy.
Posts: 6310 | From: Vallejo | Registered: Sep 2006
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*EPIK*
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Member # 7481
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That's foreign language to me Duncan. What does that mean in lamens terms LOL.
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=91 Notch:12.31@110 **Under Construction**
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Posts: 6966 | From: 916 | Registered: Mar 2007
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Stang66
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Member # 10504
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Dished pistons? Boosted setup?
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1966 Ford Mustang
1990 Notchback
1975 Pontiac Trans Am 400ci
Posts: 754 | From: Stockton | Registered: Dec 2010
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*EPIK*
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Member # 7481
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Nope. I plan on going N/A.
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
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Posts: 6966 | From: 916 | Registered: Mar 2007
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*EPIK*
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Member # 7481
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Ok, so I finally found the printing that says 4340 on the crank, so I now it's forged, just need to find out about the piston compression ratio now.
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
http://www.djepikmusic.com
Posts: 6966 | From: 916 | Registered: Mar 2007
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Duncan Motors
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Member # 7045
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lol well being my dick self lol, i can honestly say me niether lol. ur gona have to call or take that stuff to a machine shop and have a real machinest tell u. i gotta guy rich at tem machine shop i use. he can help u. 707 252 7907 if u wish.
Posts: 6310 | From: Vallejo | Registered: Sep 2006
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SLOW95GTS
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Member # 10365
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I used this and it's pretty damn accurate ( says mine will be at 9.8-1 compression with stock short block and the same heads you got.
http://www.csgnetwork.com/compcalc.html
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1995 Mustang GTS 5.0 - "minor mods"
Posts: 1199 | From: East Bay | Registered: Oct 2010
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*EPIK*
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Member # 7481
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quote:
Originally posted by SLOW95GTS:
I used this and it's pretty damn accurate ( says mine will be at 9.8-1 compression with stock short block and the same heads you got.
http://www.csgnetwork.com/compcalc.html
Thanks man... I'm hoping to get 10.5-1.
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
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Posts: 6966 | From: 916 | Registered: Mar 2007
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4IDFOX
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Member # 9921
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Using a little google fue because the comp hight seemed a little different to me.
A 347 usually uses a 1.175 comp hight. So it looks like those pistons are for use with a 3.47 stroke crank. Better check what that crank is.
Posts: 375 | From: Redding CA | Registered: Apr 2010
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triple b
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Member # 8763
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changing the head gasket thickness would help too....but like duncan said take it to a shop if your having trouble understanding all those mesurements
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1988 4cyl conv 306 HCI "sasha"
2004 tahoe
Sold- 87 GT, 72 chevelle, 63 biscane, 82 monte carlo, 73 nova, 88 silverado,
Posts: 1730 | From: sacramento ca | Registered: Nov 2008
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*EPIK*
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Member # 7481
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posted
quote:
Originally posted by 4IDFOX:
Using a little google fue because the comp hight seemed a little different to me.
A 347 usually uses a 1.175 comp hight. So it looks like those pistons are for use with a 3.47 stroke crank. Better check what that crank is.
It's a 347 Stroker kit
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
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Posts: 6966 | From: 916 | Registered: Mar 2007
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4IDFOX
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Member # 9921
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According. To the box those pistons have a 1.10 compression hight. Most 347's use a piston with 1.175 compression hight a crank with 3.4 stroke and 5.4 rods.
If the crank is 3.4" stroke you are going to need 5.47 rods to make those pistons work. 5.47 rods are not common and will most likely a custom piece.
Those pistons are for a 354 stroker kit. It uses a 3.47 stroke crank and 5.4 rods. You need to figure out what crank you have.
Posts: 375 | From: Redding CA | Registered: Apr 2010
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*EPIK*
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Member # 7481
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These are the part numbers on the crank & rods. When I look them up it says they are for a 347. Maybe the pistons are wrong?
[ 2013-10-26, 12:43 PM: Message edited by: *EPIK* ]
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
http://www.djepikmusic.com
Posts: 6966 | From: 916 | Registered: Mar 2007
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*EPIK*
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Member # 7481
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posted
quote:
Originally posted by 4IDFOX:
According. To the box those pistons have a 1.10 compression hight. Most 347's use a piston with 1.175 compression hight a crank with 3.4 stroke and 5.4 rods.
If the crank is 3.4" stroke you are going to need 5.47 rods to make those pistons work. 5.47 rods are not common and will most likely a custom piece.
Those pistons are for a 354 stroker kit. It uses a 3.47 stroke crank and 5.4 rods. You need to figure out what crank you have.
Thanks for the info. Looks like I'm gonna have to head down to the machine shop on monday to have these parts checked out. I think this might actually be a 3.47 crank?
http://www.eaglerod.com/index.php?option=com_content&task=view&id=33&Itemid=40
[ 2013-10-26, 02:11 PM: Message edited by: *EPIK* ]
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
http://www.djepikmusic.com
Posts: 6966 | From: 916 | Registered: Mar 2007
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4IDFOX
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Member # 9921
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posted
What you have is a 354 stroker kit. That is a 3.47 crank. A 347 stroker crank would be 3.40 stroke
A dart block would be a good way to go with that stuff. As they have a little longer cylinder to support the piston skirt at the bottom of the stroke.
[ 2013-10-26, 05:51 PM: Message edited by: 4IDFOX ]
Posts: 375 | From: Redding CA | Registered: Apr 2010
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*EPIK*
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Member # 7481
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posted
quote:
Originally posted by 4IDFOX:
What you have is a 354 stroker kit. That is a 3.47 crank. A 347 stroker crank would be 3.40 stroke
A dart block would be a good way to go with that stuff. As they have a little longer cylinder to support the piston skirt at the bottom of the stroke.
Oh ok. Thanks. So a stock block can't be used with a 354 stroker kit?
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
http://www.djepikmusic.com
Posts: 6966 | From: 916 | Registered: Mar 2007
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Duncan Motors
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Member # 7045
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posted
it puts bad side load down low on a stock block. killer kit but i dont think gd for your block, there is a dart block on teh ford sale section,,,
Posts: 6310 | From: Vallejo | Registered: Sep 2006
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*EPIK*
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Member # 7481
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posted
quote:
Originally posted by Duncan Motors:
it puts bad side load down low on a stock block. killer kit but i dont think gd for your block, there is a dart block on teh ford sale section,,,
Ahhhh I see. Well, looks like I will be saving up for a block now, or just looking into a different kit. I wouldn't have to pay anything for this kit, I would be trading some parts for this.
Thanks again
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
http://www.djepikmusic.com
Posts: 6966 | From: 916 | Registered: Mar 2007
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*EPIK*
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Member # 7481
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posted
What is a rough power estimate of a healthy n/a 354 stroker motor? Custom cam, good heads, full exhaust etc.
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
http://www.djepikmusic.com
Posts: 6966 | From: 916 | Registered: Mar 2007
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Mr.10psi
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Member # 11062
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posted
quote:
Originally posted by *EPIK*:
quote:
Originally posted by Duncan Motors:
it puts bad side load down low on a stock block. killer kit but i dont think gd for your block, there is a dart block on teh ford sale section,,,
Ahhhh I see. Well, looks like I will be saving up for a block now, or just looking into a different kit. I wouldn't have to pay anything for this kit, I would be trading some parts for this.
Thanks again
Epik ill help you out sir. If you havent bought the kit yet i would advise to take a different approach and start out knowing exactly what you have and whats what. You say you want n/a power out of a 347 but this kit is providing you a dished piston. Flat top piston is really what you want to get that 10.5 compression. Doing it this way will allow you to not have to spend coin on a dart block and will still be safe on the stock block. If you want to take the guess work out, just buy a forged rotating assembly 347 stroker kit from eagle and take it to your machine shop and have them machine and balance etc and assemble it or you can do it. If you go the custom route you will have to figure out stroke, rod length, piston compression height and deck clearance along with deck height. Its not hard at all just a little math.
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02 white saleen(sold) 347 stroker in the works
Posts: 1337 | From: 530 | Registered: Jul 2011
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Mr.10psi
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Member # 11062
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posted
quote:
Originally posted by Mr.10psi:
quote:
Originally posted by *EPIK*:
quote:
Originally posted by Duncan Motors:
it puts bad side load down low on a stock block. killer kit but i dont think gd for your block, there is a dart block on teh ford sale section,,,
Ahhhh I see. Well, looks like I will be saving up for a block now, or just looking into a different kit. I wouldn't have to pay anything for this kit, I would be trading some parts for this.
Thanks again
Epik ill help you out sir. If you havent bought the kit yet i would advise to take a different approach and start out knowing exactly what you have and whats what and get a different kit. You say you want n/a power out of a 347 but this kit is providing you a dished piston. Flat top piston is really what you want to get that 10.5 compression. Doing it this way will allow you to not have to spend coin on a dart block and will still be safe on the stock block. If you want to take the guess work out, just buy a forged rotating assembly 347 stroker kit from eagle and take it to your machine shop and have them machine and balance etc and assemble it or you can do it. If you go the custom route you will have to figure out stroke, rod length, piston compression height and deck clearance along with deck height. Its not hard at all just a little math.
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02 white saleen(sold) 347 stroker in the works
Posts: 1337 | From: 530 | Registered: Jul 2011
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Mr.10psi
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Member # 11062
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posted
quote:
Originally posted by *EPIK*:
What is a rough power estimate of a healthy n/a 354 stroker motor? Custom cam, good heads, full exhaust etc.
420-430rwhp would be a good base.
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02 white saleen(sold) 347 stroker in the works
Posts: 1337 | From: 530 | Registered: Jul 2011
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4IDFOX
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Member # 9921
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If you are going to build an n/a engine that is under 600 hp. It is my opinion that a forged crank and h beam rods are not needed. They are heavy. A good cast crank, good I beam rods and light pistons are the way to go. A lighter rotating assembly will not make more hp but will make rpm quicker witch = quicker car.
I am in the middle of a swap in a good friends bracket car. It a 347, afr 195 comp heads, solid roller cam, carbed. Cast crank and I beam rods. It was built by AD engines in Seattle and promised it was at least 525 at the crank with no worries about the crank or rods.
Posts: 375 | From: Redding CA | Registered: Apr 2010
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