how much hp are ls7 rods worth
04-07-2022, 12:40 AM
#61
I've never heard that (or experienced it) in any engine I've assembled. The engine doesn't know the composition / alloy of the piston, it's simply an air pump; Nor is it responsible for providing sealing under combustion or intake stroke. The rings provide that function. The only way one can screw that up with a piston (of any make or design) is to get the piston to cylinder wall clearance wrong...and it would have to be really really wrong to lose 25whp.
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G Atsma (04-07-2022)
04-07-2022, 03:37 AM
#63
IDK where you got that info, but I'd like to see the info. Every serious racing engine developed in the last 50 or 60 years have had dry sump oiling, because they move the oil away from radiant heat, keep oil supplied to the engine under high g-forces, and allow for better internal breathing due to little to no oil level. I've never seen any serious racing engine use a wet sump......
04-07-2022, 08:51 AM
#64
Yes, it does.
I wasn't referring to reciprocating mass- though I'll bite:
The stock standard bore 5.3 pistons in my assy each weighed 406g and the pins were 162g.
My plain jane Summit (Wiseco) 0.030" pistons weighed 437g, but the pins were 124g- 7 grams lighter in mass.
Still- that doesn't make by itself 25whp.
Weight matters, yes. But I usually wory about reciprocating mass when I'm buzzing the engine >7.5k....and my wallet is screaming to be emptied.