Originally Posted by adam325i
Sometime Princess auto has hoses that they can make up, aswell as TSC store.
If your looking for AN hardware and other little bits of cool, good quality pieces like AN fitting. Look at www.aircraftspruce.ca
thanks for the website link..
Originally Posted by everlast
The ottawa Princess Auto can make custom hoses, and have JIC fittings which are very, very close to AN fittings (different thread cut but otherwise identical). I used JIC fittings everywhere on my turbo and saved myself 15% or more by switching to Geico.
Problem is the fitting adapters from Metric to JIC. The hydraulic shop prices are very very similar and I can get everything at once and technical help too since I dont know anything about hydraulics...lol...
Still waiting for pump to arrive I will bring it with me...there on belfast 10 minutes from work.
I'm just wondering, for my own supercharger build coming up, about pulley sizing.
I have an Eaton M90, with a 3" pulley.
I'm hoping to run the A/C pulley, but I have no idea what sorta boost that will give. (or what size that pulley is)
Is there a calculation to see what psi different pulley sizes will give? I'm aiming for 9-12 psi.
I'm just starting to read about S/Cing, and man there sure is a ton of info. "
I tough I would post your question here so everybody that has the same question can see it.
The calculations are as follow (and also in my blog) I recommend you check out my blog. I see a lot of people going Roots type blowers and they are totally not prepared for it and have no idea of the amount of work it is involved... I recommend you also read Supercharged! by corky bell have a plan put it on paper, read everything you can, learn from others that have done it.
Here is my calculations:
Crank Pulley Circumferance = cm 12.446 - 4.9"
S/C Pulley Circumferance = cm -6.60 - 2.6"
Ratio = 1.885 / 1 = 1.885
@ 6500 rpm = 12,257 S/C rpm
(M90 outup is 1.5L)
M62 supercharger output capacity = 1 L/ rpm = 12,257 L
(LPM*.03531 = CFM) = 432 CFM of air
2.5 engine can inhale 252.6 CFM(not 100% sure here for M20) of air
Excess air = 432 – 252.6 = 180 “boosted” CFM
Boost = excess CFM / normal CFM * atmospheric pressure
180 / 252.6 * 14.7 = 10.5 PSI pounds boost
this is approximate (doesnt take account intercooler pressure drop, pipes, elevation, how freely you engine breaths, belt slip..etc..)
With my intercooler and freeflow headers/exhaust Its more like 5PSI, so that is why am getting a 7" diameter Crank wheel since my SC pulley is already 2.65" cant go any lower and am looking for a little more boost for my SC side plus I will go 6 rib instead of 5 at the same time since my SC pulley is 6 Rib.
Once I add the turbo I want a compounded Max boost of 15-17 PSI.
Good luck would be cool to see another roots type bmw around!!