This is topic cam questions b303 in forum Tech Talk at Northern California Ford Owners  .


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Posted by The_Drivah (Member # 8823) on :
 
I have to b303 and am gonna run it with my 1.7 crane rockers. Some say it will be ok some say change the springs, personally I dont know what to do will it work or will and if so what will need to be change... stock bottom end on a 88 coupe?? I just want to swap cams and play, lmk thanks guys
 
Posted by CornOil_&_Boost (Member # 5888) on :
 
stock spring will be fine..install them oth and run..
 
Posted by KARATExxCHUCK (Member # 12851) on :
 
I wouldnt run the stock springs in my opinion. Use the springs that are called for on that cam. The last thing you want to do is to go cheap and mess up your engine. I understand that you want to throw it in and have some fun. I had the same thinking as you when I first got my stang, but after thinking about it for a while i decided to do it right.

This should help you,
http://www.roushyatesparts.com/v/vspfiles/assets/images/ford_racing_camshafts.pdf

What ever you decide to do I wish you the best of luck. Have fun,

Charles [Big Grin]

[ 2013-09-23, 11:11 AM: Message edited by: KARATExxCHUCK ]
 
Posted by CornOil_&_Boost (Member # 5888) on :
 
seen it done on stock springs 100's of times....it's an old school way to squeeze some HP out of the car....you dont have to change the stock ones
 
Posted by Tom Renzo (Member # 13165) on :
 
A set of springs are a 130 BUCKS and an hour to install at best.And while you are at it you can change the stem seals that fail all the time on the 302. The 302 is notorious for having weak springs. They mos likely will work but new ones would be what i would do. I have seen to many broken springs in my career. By the way valve springs actually have a life span. I change mine every 30K as recommended by the supplier.

NOTE if you choose to replace the springs remember to break them in properly!!

-

[ 2013-09-23, 05:28 PM: Message edited by: Tom Renzo ]
 
Posted by SLOW95GTS (Member # 10365) on :
 
what heads?
 
Posted by KARATExxCHUCK (Member # 12851) on :
 
quote:
Originally posted by Tom Renzo:
A set of springs are a 130 BUCKS and an hour to install at best.And while you are at it you can change the stem seals that fail all the time on the 302. The 302 is notorious for having weak springs. They mos likely will work but new ones would be what i would do. I have seen to many broken springs in my career. By the way valve springs actually have a life span. I change mine every 30K as recommended by the supplier.

NOTE if you choose to replace the springs remember to break them in properly!!


-
Dang!!!

[ 2013-09-23, 08:52 PM: Message edited by: KARATExxCHUCK ]
 
Posted by KARATExxCHUCK (Member # 12851) on :
 
quote:
Originally posted by CornOil_&_Boost:
seen it done on stock springs 100's of times....it's an old school way to squeeze some HP out of the car....you dont have to change the stock ones
Wouldn't it cause valve float if you run stock springs with that cam and 1.7 rockers?

Charles
[patriot]

[ 2013-09-23, 08:51 PM: Message edited by: KARATExxCHUCK ]
 
Posted by CornOil_&_Boost (Member # 5888) on :
 
quote:
Originally posted by KARATExxCHUCK:
quote:
Originally posted by CornOil_&_Boost:
seen it done on stock springs 100's of times....it's an old school way to squeeze some HP out of the car....you dont have to change the stock ones
Wouldn't it cause valve float if you run stock springs with that cam and 1.7 rockers?

Charles
[patriot]
No...you can [patriot] but really he's not going to run the type of RPM to cause this...the type of cam and valve springs is not the cause of valve float anyways...

i think you need to research a little on what valve float actually is...

[ 2013-09-24, 10:46 AM: Message edited by: CornOil_&_Boost ]
 
Posted by KARATExxCHUCK (Member # 12851) on :
 
quote:
Originally posted by CornOil_&_Boost:
quote:
Originally posted by KARATExxCHUCK:
quote:
Originally posted by CornOil_&_Boost:
seen it done on stock springs 100's of times....it's an old school way to squeeze some HP out of the car....you dont have to change the stock ones
Wouldn't it cause valve float if you run stock springs with that cam and 1.7 rockers?

Charles
[patriot]
No...you can [patriot] but really he's not going to run the type of RPM to cause this...the type of cam and valve springs is not the cause of valve float anyways...

i think you need to research a little on what valve float actually is...
Everyone who I talked to told me not to run this setup because it would cause valve float. One of which was a Ford Certified mechanic. So, when you someone with his credentials tells you this you take it to heart. I just gave him my opinion trying to help out. No one is holding a gun to his.

Like i said, which ever he decides to do
I wish the best of luck to him.

Charles [patriot]
 
Posted by CornOil_&_Boost (Member # 5888) on :
 
quote:
Originally posted by KARATExxCHUCK:
quote:
Originally posted by CornOil_&_Boost:
quote:
Originally posted by KARATExxCHUCK:
quote:
Originally posted by CornOil_&_Boost:
seen it done on stock springs 100's of times....it's an old school way to squeeze some HP out of the car....you dont have to change the stock ones
Wouldn't it cause valve float if you run stock springs with that cam and 1.7 rockers?

Charles
[patriot]
No...you can [patriot] but really he's not going to run the type of RPM to cause this...the type of cam and valve springs is not the cause of valve float anyways...

i think you need to research a little on what valve float actually is...
Everyone who I talked to told me not to run this setup because it would cause valve float. One of which was a Ford Certified mechanic. So, when you someone with his credentials tells you this you take it to heart. I just gave him my opinion trying to help out. No one is holding a gun to his.

Like i said, which ever he decides to do
I wish the best of luck to him.

Charles [patriot]
have this mechanic explain valve float to you and how possibly a cam; just above stock, is going to cause float anywhere from 0-5800RPM.... [Roll Eyes]
 
Posted by El komander (Member # 10751) on :
 
Be seen a bone stock 5.0 with just a b cam with gears and slicks take out some ls1 maros , never had a problem with the motor ,just run it
 
Posted by KARATExxCHUCK (Member # 12851) on :
 
quote:
Originally posted by CornOil_&_Boost:
quote:
Originally posted by KARATExxCHUCK:
quote:
Originally posted by CornOil_&_Boost:
quote:
Originally posted by KARATExxCHUCK:
quote:
Originally posted by CornOil_&_Boost:
seen it done on stock springs 100's of times....it's an old school way to squeeze some HP out of the car....you dont have to change the stock ones
Wouldn't it cause valve float if you run stock springs with that cam and 1.7 rockers?

Charles
[patriot]
No...you can [patriot] but really he's not going to run the type of RPM to cause this...the type of cam and valve springs is not the cause of valve float anyways...

i think you need to research a little on what valve float actually is...
Everyone who I talked to told me not to run this setup because it would cause valve float. One of which was a Ford Certified mechanic. So, when you someone with his credentials tells you this you take it to heart. I just gave him my opinion trying to help out. No one is holding a gun to his.

Like i said, which ever he decides to do
I wish the best of luck to him.

Charles [patriot]
have this mechanic explain valve float to you and how possibly a cam; just above stock, is going to cause float anywhere from 0-5800RPM.... [Roll Eyes]
I'm not trying to get into a debate with you Corn oil. I was just passing on what i thought was correct information.

Best of luck!

Charles [patriot]
 
Posted by Tom Renzo (Member # 13165) on :
 
Ok here we go. Valve springs on stock engines are normally not designed to exceed 5000 RPM crank speeds or 2500 cam speeds. Stock springs or for that matter most single springs will loose 20-25% of there effective load in as low as 30,000 miles. This is not an issue with a stock engine as they rarely exceed 5000 RPM or 2500 cam RPM. BUT!!! when you install a bigger cam with more lift and duration the valve events are much more radical than stock. This includes more lift and duration that send the springs in to TRANSIENT VIBRATIONS. Once this happens the lifter if HYDRAULIC will pump up and the valves will FLOAT or better explained come off the seats when they are on the seats!! Remember stock springs run around 70-80 lbs and are somewhere around 170 @ 500 L. Increasing lift duration and valve event will allow the lifter to pump up causing FLOAT. Remember you also have to take in to account the pressure the hydraulic lifter adds to the push back on the springs. That is somewhere around 10-15 Lbs depending on the lifter. So with old springs and a hydraulic cam with old springs you are on a road to a train wreck. I do tuns of 2.3 ford turbo engines and there springs are always way to week in stock condition. Adding a bigger cam and the setup is not going to work. Al;so weak springs are very bad for the exhaust values as they can overheat and burn. If the closed pressure is not sufficient for the cam and spring the valves overheat. Hope this is of some help. CHANGE THE SPRINGS.
 
Posted by Tom Renzo (Member # 13165) on :
 
No...you can [patriot] but really he's not going to run the type of RPM to cause this...the type of cam and valve springs is not the cause of valve float anyways...

I would highly disagree with this statement!!!!
 




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