Recent content by Mark Tamblyn

Thanks cjl, Good point about the EGT and increase in pressure. I didn't think about that. Another stuff up in my calcs is didn't factor in dual pipe set-up, my calcs are for a single pipe, so the flow rate could be halved. Of course due to V8 design the 2 banks work independently of each other...

I also calculated flow rate using on-line calculator 2.5" pipe = 109.5 m/sec. Theoretically would take a gas particle 0.032 secs to exit the 3.5m pipe 3" pipe = 76.09 m/sec. Theoretically would take a gas particle 0.046 secs to exit the 3.5m pipe

Hi there, prob a simple question for you physics gurus, but this application is for a race car, and question relates to air flow velocity through a pipe, in particular exhaust and intake. Now, my thinking for the exhaust (push) is that by going from a small diameter to a large diameter will...

...The only thing is, I don't know what the lowest rate is, and may well be over the 400lb, in which case preloading out this is possible, but like you said these springs are not truly progressive. I might try tonight and preload by feel and suck it and see.

Hi Randy, yes you raise good points. My car weighs about 400kg (880lbs) at each corner (im yet to do corner weighting). Wire dia, I think is 16mm but that may be for the 760lb one. I get what you are saying, in that setting preload to a certain point won't achieve anything, nor possible, as...

Thanks Randy, Mike and OldYat. Randy, yes I'll do a CG test and also doing corner weighting. Mike, I have the type1) you explained, and just in the rears. Pretty standard for rears for most US/Aussie rear wheel drive IRS sedans. However, it looks to be they are not "true" progressive rate...

sorry I made a booboo - unit should lb/in not lb/cm. Gotta get my head around the imperial vs metric. Personally I favour metric :)

Thanks Randy, but I am under the impression though that it is not good practice to set ride height using pre-load adjustment, but yes it can be used, and racers do do it ;) I plan on setting my corner weights this weekend, and will do a CG test aswell. Hi Jack, yes assume it is their highest...

Thanks Ranger Mike and thanks Jack Action for your comments. Jack Action - so for my progressive rate springs by applying more pre-load, will in fact change overall spring rate. The springs are rated at 850lb/cm, but I'm not sure of the lower rate, and would this 850lb rate be the overall rate...

Thanks for your reply Mike, but I must disagree with you, preload on a linear spring does not alter the spring rate...it only alters spring (and damper) travel distance. Its not to be confused with load of the spring, which is essentially what preload is. For example adding weight in the boot -...

Thanks Ranger Mike. Just to confirm...this is only for a progressive rate spring you refer to, right? I am under the impression setting pre-load does not alter rate for a linear spring (Hookes Law), and many other forums suggest this too. I am referring to specifically a progressive rate spring...

Hello I have a question on coil-over preload for Progressive springs. I understand the theory on spring rates, in that setting pre-load does not alter spring rate (Hookes Law), it just compresses the spring, adding load, which does raise the height of the car. Setting pre-load is necessary so to...