At 13:1 compression, which is pretty high, are you having any issues with over-heating. Talked to a few guys with Big Bore motors, and they said after you bump up the compression past 12:5/1 you start having some serious issues over the long-run. And reliability seems to suffer quite a bit after 12:5/1. Wondering if this is something your builder talked to you about, or if you have heard this before?
All true...prolly more so with the BB kits than a block that was prolly only honed a bit.
I was riding with my freind here in the FL heat and traffic...it wasn't anything the muzzy fan/engine ice couldn't cope with.
Taking meat from the cylinder sleeves is how the heat warps them in most cases...or allows fissures to form.
As long as it's mapped right (tis better to err on the side of a rich mixture, rather than lean) ...and he isn't riding with the front wheel in that air the whole time (difficult for oil flow that way)....a stock bore higher compression kit could be as long lived as any other. OR.... He could always go with a high volume oil pump gear.
I knew there was a loss, I just didn't know the percentage and had never heard anyone reference here before. It is a big deal over on the SVTperformance board and ways to minimize it.[/QUOTE]
there are lots of ways....most all of them expensive.
You have to fight everything from oil viscostiy to case internals to the wind.
By the time your power gets from the crank...through the clutch (which could be slipping a little) turning the input shaft on the tranny and those gears...then the output shaft and those gears ....the countersprocket...the chain..the rear weight of the rear wheel assembly...all chain waxes, oils lubes and bearings in between....it's all loss.
we really loose less than most....but just about all vehicles experience it...so be it.
I.E. my HEMI rated at 345HP would prolly yield a meager 275 (on a good day) at a dyno.
remember that just about everything is trying to take power from you.
