BC Cams Performance
- Thread starter LumbChuck
- Start date
Damn! Ian, I wanted to say that, but figured... eh, why stir the pot?
Fact is, I doubt ANY manufacturer has actually bolted their cams to a 7M, and done real-world testing.
That's why I'll end up going custom cams, after I determine exactly how my powerband feels, and looks on the dyno graph. I'll use the stock specs (which I'll have on a spec sheet) to determine how much more duration I will go for, and a flow test of the head will give me a good idea how much lift I should go for, as well.
I'll play with the LSA to broaden the powerband wherever the turbo wants it
Fact is, I doubt ANY manufacturer has actually bolted their cams to a 7M, and done real-world testing.
That's why I'll end up going custom cams, after I determine exactly how my powerband feels, and looks on the dyno graph. I'll use the stock specs (which I'll have on a spec sheet) to determine how much more duration I will go for, and a flow test of the head will give me a good idea how much lift I should go for, as well.
I'll play with the LSA to broaden the powerband wherever the turbo wants it
are you going to get the LSA preset into the cams different from stock LSA or are you just going to use adjustable cam gears?
Doward said:
Probably tru about US manufactures.
Kind of explains why BC claims that the stock cams are 256 duration
(they are not)
But I know for a fact that TODA, HKS, JUN, and TOMEI all raced the 7M back in it's day, and their grinds were developed on their race engines.
Pretty sad that all US manufacture's development time is spent flogging the 50 year old cast pig iron V8s......
I guess I'll stick with my JDM cams...........
By the way,
Thank you yannis-supras for the fantastic power steering pulleys !
Really helped me out.......
Thank you yannis-supras for the fantastic power steering pulleys !
Really helped me out.......
I'm pretty sure the stock cams are 256 duration. That duration was measured at 0" not .050" like cams are usually measured.
bowsercake said:
Well, that then is giving an atificial duration increase because it includes the pre-ramp ground into the cams, and is too close to actual valve clearance.
I agree that the .050" is not correct for a cam & bucket style head.
Typically the .050" is used on US pig iron V8s with 100 year old push rod valve train. So much flex, that they had to go to that much lift just to get all the stamped sheetmetal parts to load up.
A more reasonable figure is a half a milimeter (.020").
I'll be pulling a head in the next few days, and will take the stock, and my HKS cam timing numbers.
I suspect that the stock cams come in around 248,
and my HKS cams will be spot-on.
dude your over lap is crazy did you time in your cam gear per install with dagree wheel and lift guage
and ajustablte cam gear's shine when you have after market cams
and ajustablte cam gear's shine when you have after market cams
supra90mkiii said:
I have the same cams installed on my head. Headwork: ported, polishd intake and exhaust, BC 264's, BC springs and Ti retainers, professionally installed with 1mm o/s precision valves. lotsa other work to support all this and 60-1 turbo etc etc etc. no MAFT pro tho...just curious what you ended up degreeing ur cams in at what timing...BC says 8 BTDC... any spec info would help. also i have adjustable cam gears ready to go, just kinda dont want to fiddle with this molarchy...cars been down for months i wanna drive it already and this last thing is annoying me. any help is help. thxsupra90mkiii;652668 said: