Firebug's V6 Gemini

[0081]

what sort of temps are seen with non intercooled setups?

Depends on pulley size.

I ran a 82mm pulley and saw intake temps on 100 degrees C

[vlad01]

thats not bad, how many psi?

[immortality]

That would depend on the engine mods but the 82mm/3.2" pulley is also referred to as the 12psi pulley.

[0081]

thats not bad, how many psi?

About 9 to 10 psi measured in the lim.

Im running a xp hot cam and a bit of blower porting also

[vlad01]

The eaton SC have pretty high discharge temps compared to screw type SC. I've love to see a comparison.

Hard to find this info on google.

[ralcool]

The usual trip to town is 55km downhill, mostly boring, but then climb back up to 550m above sea level on the return run is ab fab.

Superchargers are awesome. The return of investment of this engine is unquestionable.

Powwwaarrrrrr! (Clarksons voice again)

[vlad01]

Im looking at 2.4L/ per rev Whipple E85 fueled, and pretty beefy engine, alloy heads, forged pistons and billet everything else.

I came across yella terra kits to convert L67 to run whipple but with the intercooler I'm 90% certain with the measurements it wont fit under VN/VP bonnets being so low and flat.

Im sure it will be fine with E85 even with the rated 16-18 psi non intercooled due to its resistance to detonation and cooling effects to boot.

Im going to visit yella terra tomorrow as I will be 10 min from them and measure it all myself.

There is guy I have been speaking to with 2.9L whipple A2A plate and stroked L67 with the alloy heads making around 850hp crank at 7800 rpm lol. Does 9.8 pass or there abouts in a VP wagon.

Finally real supercharger POWWA!

[immortality]

Those Whipple kits are nice, I'd love one for the Senator one day.

[psyolent]

not wrong on temps VSH

http://www.tccoa.com/articles/engine/allensvo.html

About the whipple blower. From a friction loss standpoint the whipple blower is only worth about 10 more HP. The big advantage is in discharge temperature. At 15 psi boost, and 14,000 rpm blower speed, the Eaton M90 has a discharge temperature of 175 C, or 350 F. The whipple at the same boost and speed has a discharge temp of 125 C, or 250 F. This is huge difference in outlet temperature that relates directly to being able to run more spark.

[vlad01]

the roots and screw displace air in very different ways. Roots are only typically iirc 35-60% efficient while screw are 70-85%. So that translates to less heat and more volume per HP to drive them, yielding more net power.

other thing is the screw operate volume per rpm more or less linearly where the roots have a inverse parabola curve, so low rpm and high rpm are crap and mid rpm is best. Thats blower rpm not engine we are taking about.