403 ls2 stroker
Thread Starter
Cruising
Joined: Jan 2007
Posts: 11
Likes: 0
From: miami fl.
403 ls2 stroker
Hey guys need some help i have a 2000 m6 c5 it has a 403 ls2 in it. My first question is the motor has about 5000 miles on it and its burning some oil more than before is this normal? Im also thinking of sc or maybe turbos but its 11.1 is that to high of comp. for fi? Sorry one more thing the car is putting down 466rwhp. What numbers could i get with fi safey? 
Racer
Joined: Jun 2005
Posts: 340
Likes: 21
From: College Station Tx.
ive got a 402 stroker and it burns oil also. (im only at 3.000 miles on my motor).
If your engine is forged, which i guess it is then i would say go ahead and add Forced induction(i like the procharger D1), and maybe add about 8lbs of boost. You would be in the solid 6XX's rwhp.
If your engine is forged, which i guess it is then i would say go ahead and add Forced induction(i like the procharger D1), and maybe add about 8lbs of boost. You would be in the solid 6XX's rwhp.
Last edited by rangerob; Jun 19, 2007 at 09:19 AM.
Pro
Joined: Jun 2005
Posts: 734
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From: Austin TX
11.1 is pretty high compression to be running any boost. What heads are on the engine? If you really want to get boost on it the only viable option might be to swap to lower compression heads and add a thicker intake gasket. Not sure this will even get you low enough for a blower.
The setup (if it's forged) does sound like it's perfect for nitrous assuming you don't have a reverse split cam. What're the cam specs?
As for the oil burning; welcome to stroker motors. To eliminate some potential posibilities get the updated PCV valve from GM and add a catch can to you PCV system. You may just be losing oil into you intake.
The setup (if it's forged) does sound like it's perfect for nitrous assuming you don't have a reverse split cam. What're the cam specs?
As for the oil burning; welcome to stroker motors. To eliminate some potential posibilities get the updated PCV valve from GM and add a catch can to you PCV system. You may just be losing oil into you intake.
Melting Slicks
Joined: Nov 2004
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From: Tinker till it blows... then back it off a notch, maybe!!
St. Jude Donor '08
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Race Director
Joined: Dec 2004
Posts: 13,760
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From: Haymarket VA
I'm running an LS2 block forged 403 with L92 heads and don't use an ounce of oil. In fact, after about 3k miles I checked the catch can and it had about 1/2 teaspoon of oil in it. I run 11.3:1 and drive the pi$$ out of the car. No smoke either.
Maybe I'm just lucky.
Maybe I'm just lucky.
Le Mans Master
Joined: Jan 2001
Posts: 5,786
Likes: 6
From: Lafayette Colorado
Oil compsumption on motors is a direct result of the type of rings used and the break in procedure that was used. Cheap rings or bad break in will result in the rings not seating correctly and oil compsumption.
Keith
Keith
Melting Slicks
Joined: Nov 2004
Posts: 2,715
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From: Tinker till it blows... then back it off a notch, maybe!!
St. Jude Donor '08
10 years+ of buiding race and street engines in the 70's and UNLESS we built it extremely loose for a particular application, NONE of my forged engines ever burnt more oil than oem. A little extra from more piston to wall clearance, but not noticeable.
I retired from this in the early eighties, so I don't have much first hand experience with the LSx engines, but if you PAID good money for a built engine, especially for a street application, it really shouldn't burn oil.
jmo
btw: I am building a small 346 for my 1000 hp whipple project, so I hope i don't eat my words...
Drifting
Joined: Dec 2002
Posts: 1,472
Likes: 1
From: Reynoldsburg oh
I agree but it seems weird his would be using more after some mileage. My 402 stroker used some oil in the beginning but that was before the motor was broke in completely. Now after 4k miles on it, it uses hardly any at all...
Le Mans Master
Joined: Nov 2005
Posts: 6,344
Likes: 22
From: Alexandria VA
No one is saying its not uncommon for a stroker to burn oil, it is NOT normal for one to burn more after "break in". Throwing boost at a motor that may not be 100% doesn't sound like a great idea at this point.Also - isnt a CR of 11.1:1 a bit high for a GOOD FI build application especially under the assumption the motor may or may not be forged?
Why wouldnt you have had them drop the CR while building if you knew you were going FI? Seems backwards...
Last edited by valdeztke; Jun 26, 2007 at 08:37 AM.
Racer
Joined: Apr 2005
Posts: 357
Likes: 0
No one is saying its not uncommon for a stroker to burn oil, it is NOT normal for one to burn more after "break in". Throwing boost at a motor that may not be 100% doesn't sound like a great idea at this point.Also - isnt a CR of 11.1:1 a bit high for a GOOD FI build application especially under the assumption the motor may or may not be forged?
Why wouldnt you have had them drop the CR while building if you knew you were going FI? Seems backwards...
