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PA's 140 was yesterday, 138.5 was session 1 today. They think they have another second in the car and hopefully can beat the track record. Knowing RS was on a new motor it was quite disheartening to see them have to get pulled off the track in session 1. Hopefully both RS and PA can get their cars fixed for the last two sessions.
Wow, what an effort the RS Motors guys did there in that last session (head was off!!!)
Andy ended up posting a 1:40.5xx w/a somewhat ill running donor motor that didnt like the high boost setting. With a healthy motor / tune, i have no doubt that RS would be a 1:38xx or better
CanJam, i think, ran a 1:38.2xx which takes the record from a Honda Civic, if you can believe that 2wd held the record (wow)
PA had trouble & could not lay down a clean run in that last session
Heres a screen shot of the last attempt, cranking up the boost to full
Amazing driving. Interesting to see the rear end or whole car skip over some of those berms and corners, you can hear it. Or the ACD is trying to figure it out/going crazy haha
We've been really good with motors over the years until this year. Only killed 2. Both failures have to do with coolant going where it shouldn't and becoming a torch.
The donor engine we used had a pre-existing issue, right away it started pushing coolant. Tried lowering boost and re-torque the head studs. That helped and almost made a full lap. With one session left it was decided to do a dirty head gasket swap. This fix worked well and made the entire last session with perfect coolant temps. Had we just did one more lap at lower power we could have been in the 38's. We had some tire rubbing issues and i was coasting around riverside as I thought it was a BIG rub (turned out it wasn't as bad as I was imagining).
The only "solution" these days seems to be torq plating at machining, or going with one of the fancy billet blocks.
lolwut
Torque plate is only to bring the bores to their "distorted" state to match the head being torqued down when honing so that the bore is round with the head torqued down.
Not blowing head gaskets is mostly a tuning thing. Too much timing will lift the every time time. Otherwise, the power level that these time attack motor are at, oring'ing the head probably not a bad idea. But a billet block certainly isn't needed.
Torque plate is only to bring the bores to their "distorted" state to match the head being torqued down when honing so that the bore is round with the head torqued down.
Not blowing head gaskets is mostly a tuning thing. Too much timing will lift the every time time. Otherwise, the power level that these time attack motor are at, oring'ing the head probably not a bad idea. But a billet block certainly isn't needed.
That's old news. There's several pieces out there discussing it. When we discussed this last year at PRI they went into how Bob's machine shop doesn't "really" get it right because they don't plate when doing the the cylinders causing minor vibration through the material nor deck properly blah blah. Then people use super head gaskets, or 1/2 inch head bolts, oringing, tuners fault, all that isn't "totally" the fault nor the cure. It really came down to the cast iron block itself being the weakness. There's a reason none of the state side cars are running over 100lbs boost when much of the rest of the world can. It's ....ding...evolution. You can only put so much tech into a what almost 30 year old block before metallurgy and nature eventually win. Really necessary? Nah. But at the $ some of these builds are getting to, its crazier not to think on it right.
Nov 9, 2018, 12:10 PM
