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Post by DocSpeed on Nov 7, 2005 20:15:27 GMT -5
How much power can a LT1 in a 92 vette handle? I know they have 4 bolt mains and pink rods, but I am not sure how much the rods can take. I am hoping to one day down 400RWHP with a small SC on the Vette I am getting without upgrading the bottom end. Can this be done?
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Post by Fire67 on Nov 8, 2005 9:00:38 GMT -5
Sure, Ive been told that the bottom end will hold 500 fwhp... Im making approximately 530fwhp to get my 453rwhp. Just dont try to rev it to 7000rpm and dont let it detonate.
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Post by DocSpeed on Nov 9, 2005 0:42:12 GMT -5
Anyone got any info on the pink rods?
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Post by Fire67 on Nov 10, 2005 8:52:53 GMT -5
I think the "pink" rods (actually called PM rods for Powdered Metal) are whats rated to 500hp... The stock crank should hold a bit more than that. But your combo is only as strong as the weakest link.
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Post by Fire67 on Nov 10, 2005 8:54:05 GMT -5
I think the "pink" rods (actually called PM rods for Powdered Metal) are whats rated to 500hp... The stock crank should hold a bit more than that. But your combo is only as strong as the weakest link. And when it comes to boost, the stock pistons are definitely the weakest. |
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Post by DocSpeed on Nov 10, 2005 15:33:09 GMT -5
I found out that the LT1's didn't get the PM rods till late in 94'. The pink rods are a GM performance standard and have been around since the early 70's and were used in all OEM high performance applications. I just can't find out how much they are rated to. The PM rods are supposedly just tick better than the pink rods so I wonder if 450-475 FWHP is a safe number to assume the rods are good to.
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Post by Fire67 on Nov 10, 2005 16:14:10 GMT -5
I found out that the LT1's didn't get the PM rods till late in 94'. The pink rods are a GM performance standard and have been around since the early 70's and were used in all OEM high performance applications. I just can't find out how much they are rated to. The PM rods are supposedly just tick better than the pink rods so I wonder if 450-475 FWHP is a safe number to assume the rods are good to. Cool info! I would definitely assume that's a safe number. I was told the PM rod replaced the "pink" rods as soon as they went into production. And that they were almost identical in strength. Remember that if the general says its safe to a certain number, its a conservative number. Like I said before, Im more worried about the pistons than any other part in my stock, untouched bottom end at 530 flywheel hp. |
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Post by DocSpeed on Nov 10, 2005 17:17:47 GMT -5
So do you think that you need forged pistons at your current HP level?
I may just buy a NOS kit instead on SCing the Vette, and use a small 50 shot to get me where I want to be. That way, It won't be a constant strain on the bottom end and will save me some serious intial money.
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Post by impaladave on Nov 11, 2005 6:40:45 GMT -5
Rods, maybe. If there the same cast pistons on my LT1, I don't know. I blew out my ring lands within a couple of thousand miles 8psi ( non intercooled), mail order tune.
I personally think it's pushing it, unless your talking 6psi. I don't think it's enough to get you to 400 at the wheels.
Just my $.02,
Dave
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Post by Fire67 on Nov 11, 2005 9:31:07 GMT -5
So do you think that you need forged pistons at your current HP level? Of course I do, the only reason I dont is because of my initial budget. It wasnt near enough to buy a supercharger and a motor, so Im pushing the stocker till she dies. When that day comes I'll hopefully be close to being done building the new motor. Im a firm believer that its not the boost that breaks pistons, its the detonation. If I keep running this thing detonation free on a somewhat conservative tune, I think my rings will go before the pistons. |
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Post by bangersnmash on Nov 11, 2005 23:35:59 GMT -5
\Of course I do, the only reason I dont is because of my initial budget. It wasnt near enough to buy a supercharger and a motor, so Im pushing the stocker till she dies. When that day comes I'll hopefully be close to being done building the new motor. Im a firm believer that its not the boost that breaks pistons, its the detonation. If I keep running this thing detonation free on a somewhat conservative tune, I think my rings will go before the pistons.[/quote] Too true, compression kills rings not pistons. It's the ill timed exposions that destroy the pistons. You WILL eventually get the ultimate blow by with the boost cranked, but aslong as you have a good retarder the pistons will live. I've run a 500+hp 7MGTE (turbod ofcourse) and a 900+hp 426 Hemi (12lb SC intercooled @ 8.5:1 comp) and never cracked a piston, but boy did I go through rings. Went through the same thing with the '72 Spitfire @ 6lb. You know you love your car when you are willing to do 1-2 tear downs every year. Personally, I'm gonna stick with NA for my LT1. I've had enough of the boosted blues  I remember fondly the Ghia that only needed oil changes and plugs   |
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I remember fondly the Ghia that only needed oil changes and plugs 
