I know you guys had a bit of a problem with tossing the belt when just cranking it over at startup.I have this too.I dont rembember which way it threw your belts but mine is comming off the back of the pully towards the motor.I dont run the spacer that was supplied,but I am thinking the 1/8 crank trigger is my problem and I need to shave down the spacer a 1/8.What do you think?Thanks

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Check out my Hompage,or the beginnings of one.355 dynoed at 400HP at 5800RPM & 410LBFT of TQ,on Motorhttp://www.procharged89z.cz28.com/index.html

 

Darren,

The belt throwing problem is not related to crank or blower pulley spacing. It is an alignment issue between the lowest idler and the crank pulley. The way I solved the problem was to install a fairly thin washer on the upper bracket bolt (to the head). This "pulls" the lowest idler towards the engine slightly, aligning it with the crank pulley. By aligning, I do not mean it centers it, but makes its surface parallel to the crank pulley. Hope this makes sense.


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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
Former Paxton (6-psig) with 50-hp nitrous: 12.043 @ 112.86 mph.
ATI D1SC (10-psig): 12.056 @ 116.62 mph.
All stats are altitude corrected for 3,100 feet using NHRA's Altitude Correction Table.

http://willie.camaro-firebird.org/

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

[This message has been edited by Willie (edited July 23, 2001).]

 

IM a bit lost on this one.Did yours pull the belt towards the inside of the blower pully?Towards the engine?I noticed my lower idler pully is one of the farthest ones out.it has the .800 spacer on that one I neglegted to change to the .780 spacer.I noticed the belt os riding the inside edge of the idler pully too.If this doesnt pan out you mean to say to put a small washer under the uppermost mounting point in the head,Am I right?Thanks Willie.


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Check out my Hompage,or the beginnings of one.355 dynoed at 400HP at 5800RPM & 410LBFT of TQ,on Motorhttp://www.procharged89z.cz28.com/index.html

 

Darren,

I too had that problem, though my belt was coming off the front(toward the radiator), I notched out a thin 3/8" stainless steel washer and loosened up the bracket bolts and just slid the washer between the bracket and spacer (on the bolt going into the cylinder head). I first tried a thick washer but the belt was popping off the pulley toward the the engine.

I would first install that .780" spacer in the lower idler, then see if the belt is still coming off.

Are you using the pulley shim??? .200" thick if i remember correctly...

Also didn't you have a custom pulley made for the crank? it does sound like maybe your crank trigger is throwing your alignment out of whack...



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MÅN¡ÅÇ ©
88 IROC 5.7 TPI
ATI procharger D1sc 10#'s boost, edelbrock TES, complete MSD ignition, Borla cat-back, KB subframe connectors, accel 24# injectors...and a few other go fast goodies
http://maniac.megamania.com