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Author
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Topic: wat needed for highest compression?
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mrcoupe
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Member # 8912
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posted
 
 
hey guys.i have a 93 5.0 motor that im rebuilding and my intention is to go straight carburated and make my coupe a track car with 175 shot.im of course going to do all the nessesary changes and get all the right parts i need to accomplish this.
my question is wat pistons/crank if needed do i need to get to obtain the highest compression i can get.because nitrous likes high compression right? looking to be around the 10.5 11.1 ratio
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03 termi
Posts: 419 | From: vacaville | Registered: Jan 2009
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Phil G 59
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Member # 10028
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posted
Small combustion chamber and domed pistons :-)
Posts: 13 | From: San Rafael | Registered: May 2010
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MauriSSio
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Member # 9943
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posted
quote:
Originally posted by mrcoupe:
hey guys.i have a 93 5.0 motor that im rebuilding and my intention is to go straight carburated and make my coupe a track car with 175 shot.im of course going to do all the nessesary changes and get all the right parts i need to accomplish this.
my question is wat pistons/crank if needed do i need to get to obtain the highest compression i can get.because nitrous likes high compression right? looking to be around the 10.5 11.1 ratio
which heads you going with?as was mentioned before, combustion chamber size makes a big difference and valve layout can factor in to the selection of pistons
Posts: 503 | Registered: Apr 2010
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mrcoupe
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Member # 8912
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posted
well im going to run a wet kit with 175 shot so proly go with the gt40p heads or sumthin aftermarket.some dome pistons i heard were good and some flat tops are good too but flat tops are a no no with nos right?
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03 termi
Posts: 419 | From: vacaville | Registered: Jan 2009
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MauriSSio
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Member # 9943
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posted
quote:
Originally posted by mrcoupe:
well im going to run a wet kit with 175 shot so proly go with the gt40p heads or sumthin aftermarket.some dome pistons i heard were good and some flat tops are good too but flat tops are a no no with nos right?
flat tops should be fine, dished pistons as well. Just depends on combination of piston and combustion chamber size to get the compression youre looking for.
Posts: 503 | Registered: Apr 2010
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mrcoupe
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Member # 8912
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posted
cool
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03 termi
Posts: 419 | From: vacaville | Registered: Jan 2009
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Boss 327
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Member # 9143
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If this is a track car, why limit yourself to 10.5-11:1 compression ratio?
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"You'll never truly understand building engines until you can make power N/A. FI overshadows an engines defficiency." Al Papito
Posts: 1789 | From: East Bay | Registered: May 2009
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mrcoupe
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Member # 8912
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posted
quote:
Originally posted by Boss 327:
If this is a track car, why limit yourself to 10.5-11:1 compression ratio?
Well if I can get more out of it that would be nice.how high compression can I get out of it?
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03 termi
Posts: 419 | From: vacaville | Registered: Jan 2009
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MauriSSio
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Member # 9943
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posted
Which octane are you trying to run?
Posts: 503 | Registered: Apr 2010
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Boss 327
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Member # 9143
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posted
quote:
Originally posted by mrcoupe:
quote:
Originally posted by Boss 327:
If this is a track car, why limit yourself to 10.5-11:1 compression ratio?
Well if I can get more out of it that would be nice.how high compression can I get out of it?
If your running race gas, you can get up to 14:1-15:1
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"You'll never truly understand building engines until you can make power N/A. FI overshadows an engines defficiency." Al Papito
Posts: 1789 | From: East Bay | Registered: May 2009
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mrcoupe
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Member # 8912
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posted
quote:
Originally posted by MauriSSio:
Which octane are you trying to run?
It's a straight track car so Proly 100 or race fuel.depending on my setup.
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03 termi
Posts: 419 | From: vacaville | Registered: Jan 2009
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mrcoupe
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Member # 8912
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posted
quote:
Originally posted by Boss 327:
quote:
Originally posted by mrcoupe:
quote:
Originally posted by Boss 327:
If this is a track car, why limit yourself to 10.5-11:1 compression ratio?
Well if I can get more out of it that would be nice.how high compression can I get out of it?
If your running race gas, you can get up to 14:1-15:1
Would that be fine for 150 or 175 shot?
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03 termi
Posts: 419 | From: vacaville | Registered: Jan 2009
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1fastmach1
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Member # 10137
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posted
if your gonna use nitrous i would keep the compression ratio around 11;5;1-13;1 speacially with a 150-175 shot
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REDLINE MOTORSPORTS CC EST 2011
1993 CHP sold
2004 mach 1 408 Windsor n20 fed
R.I.P. JORGE GUTIERREZ JR
6/13/1982- 11/05/2013
Posts: 2592 | From: clawwwitter to 7th st | Registered: Jul 2010
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93coupessp
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Member # 8418
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My buddy runs 15:1 with two stages equaling 300. Nitrous is about the tune and the fuel.
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89 gt project
09 f250 diesel 605hp
14 cts-v
13 harley fxdb 103ci
Posts: 1919 | From: Hell | Registered: May 2008
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mrcoupe
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Member # 8912
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posted
Right on guys I appreciate all the input.gona start looking for parts here soon and get it Rollin ![[burnout]](graemlins/burnout.gif)
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03 termi
Posts: 419 | From: vacaville | Registered: Jan 2009
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