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SVTPerformance's Chain of Restaurants
Tuning À la carte
Washed out piston rings.
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<blockquote data-quote="old01cobra" data-source="post: 16041886" data-attributes="member: 141196"><p>I've got a 5.3L stroker with flat tops and some 242/238 duration cams with .475 lift that only puts out about 145psi at best with a cranking compression test. I've done a leakdown test numerous times and I get a zero percent leak result on all cylinders. I have total seal gapless upper rings which from my understanding make oil control a little harder. Mine ran rich as ass also when I broke it in and I was nervous about cylinder wash. Ran it for about 25 minutes with 30wt with 60lb injectors and a 90mm MAF at the time with a break in tune. The thing smogged out a 50x100 ft pole barn it looked like China skies. Not sure 60lb injectors could wash a cylinder down though unless they mechanically stuck open. Your using 1300's that's over twice as much so its possible I guess, as that would be like dumping stuck 60lb injectors down each cylinder. </p><p></p><p>Needless to say it fouled out my 02's and it ran rich even at the dyno. 02's were lazy as ****. Put some new 02s in and its been fine. Till I put some leaded 110 in it by accident and it took out the 02's again and it started running rich again, one bank pegged enrichment while the other bank got lazy and would bounce rich. Every time it ran rich id get some wet oil around the threads of the plugs. I put new 02's in it and the threads dried up. It made some healthy numbers NA 460whp and 390wtq. Uses some oil but I do spin it out to 7.5-8K rpms at times. With the heads being ported so much the valve guides hang 3/4 of its total length with no aluminum around them, Im sure that doesn't help with oil consumption. I get about 120-140 miles to a tank and I add some oil maybe about +-250ml per 1000ish miles depending on driving habit. I've got a deep sump pan and I never altered the dipstick so I put 8qts in it and it just touches that's how I know I consume some oil etc. But the stock factory motor did too since it was new, I mark it up to the 32valves with the 16 exhaust valves being submerged under oil all the time. That had 30K on it and from day one it sipped some oil.</p><p></p><p>I've got around 2K miles on it and Im currently installing a blower now. Oil consumption appears to be getting better with mileage, it bothers me that it eats some. But again it makes some healthy numbers and the original OEM engine drank some oil.</p><p></p><p>What kind of compression are you running with those stock cams? Washing down cylinders takes a good amount of fuel. You're oil should have a strong fuel odor if you did.</p></blockquote><p></p>
[QUOTE="old01cobra, post: 16041886, member: 141196"] I've got a 5.3L stroker with flat tops and some 242/238 duration cams with .475 lift that only puts out about 145psi at best with a cranking compression test. I've done a leakdown test numerous times and I get a zero percent leak result on all cylinders. I have total seal gapless upper rings which from my understanding make oil control a little harder. Mine ran rich as ass also when I broke it in and I was nervous about cylinder wash. Ran it for about 25 minutes with 30wt with 60lb injectors and a 90mm MAF at the time with a break in tune. The thing smogged out a 50x100 ft pole barn it looked like China skies. Not sure 60lb injectors could wash a cylinder down though unless they mechanically stuck open. Your using 1300's that's over twice as much so its possible I guess, as that would be like dumping stuck 60lb injectors down each cylinder. Needless to say it fouled out my 02's and it ran rich even at the dyno. 02's were lazy as ****. Put some new 02s in and its been fine. Till I put some leaded 110 in it by accident and it took out the 02's again and it started running rich again, one bank pegged enrichment while the other bank got lazy and would bounce rich. Every time it ran rich id get some wet oil around the threads of the plugs. I put new 02's in it and the threads dried up. It made some healthy numbers NA 460whp and 390wtq. Uses some oil but I do spin it out to 7.5-8K rpms at times. With the heads being ported so much the valve guides hang 3/4 of its total length with no aluminum around them, Im sure that doesn't help with oil consumption. I get about 120-140 miles to a tank and I add some oil maybe about +-250ml per 1000ish miles depending on driving habit. I've got a deep sump pan and I never altered the dipstick so I put 8qts in it and it just touches that's how I know I consume some oil etc. But the stock factory motor did too since it was new, I mark it up to the 32valves with the 16 exhaust valves being submerged under oil all the time. That had 30K on it and from day one it sipped some oil. I've got around 2K miles on it and Im currently installing a blower now. Oil consumption appears to be getting better with mileage, it bothers me that it eats some. But again it makes some healthy numbers and the original OEM engine drank some oil. What kind of compression are you running with those stock cams? Washing down cylinders takes a good amount of fuel. You're oil should have a strong fuel odor if you did. [/QUOTE]
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Tuning À la carte
Washed out piston rings.
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