Cadillac 4.5 supercharged engine (Page 1/4)
Johns 4.9 APR 04, 04:10 PM
I have this engine in my 84. Looking forward to testing this summer. Going to find out how strong these motors are....or are not. Should be fun.
Cheers
olejoedad APR 04, 04:49 PM
Do you have enough belt wrap on the balancer, alternator and supercharger pulleys?
The supercharger install looks good!
Darrelk APR 04, 05:34 PM
Yeah, that looks really clean.....So what tranny are you hooking that obvious torque monster to????? I am assuming an automatic but I'm sure there are plenty of manuals that would be fun to blow up...... I had just put a supercharger on a rear rotary set-up (you know, they don't make much torque right?) to a heavily modified VW tranny with all the best of the best in it. First good launch..... tranny held fine but smoked the clutch, twisted an axle and broke 2 HD race prepped CV joints. Superchargers just change everything.......
fieroguru APR 04, 10:28 PM
I assume your alternator is the tension adjustment, so that bracket might need reworking, but this would be a much better belt path for this setup. Even then, I would make sure the idler pulley isn't just bolted to the aluminum bracket off the backside of the water pump as the torque needed to pull the supercharger load would likely snap it off.

It is good to see people doing different stuff!

Blacktree APR 05, 12:07 AM
I agree with the above. You need as much wrap as possible around the crankshaft, blower, and alternator pulleys.
Johns 4.9 APR 05, 01:24 AM
Never had any belt slip. Supercharger has more wrap then the set up it uses for the SBC. Idler pulley isn't bolted to the water pump. Goes through and bolts to a bracket that is bolted to the head. If I have any slip at the track I'll let you know.

Car is a 84 Fiero. Transmission is a rebuilt 4T60 with shift kit and 2800 stall converter with 3.73 gears.

[This message has been edited by Johns 4.9 (edited 04-05-2019).]

Johns 4.9 APR 05, 02:47 AM
fieroguru,
After looking at that idler bracket again, I agree with you about it being too weak. I think a steal bracket is a much better idea, good call. I think I will fab one up before I hit the track. As far as the belt path, looks good but it would hit the front of the water pump housing. Yeah, I tried at least a dozen variety of paths and brackets and the front of the water pump housing always gets in the way! Very frustrating. So I agree its not ideal but it is with in the physical limitations of the water pump housing. So as "much wrap as possible" is limited by the configuration of the water pump housing in this situation. There is still a lot of trial and error with this set-up. If it becomes a problem I will address it them. Thanks, man!
Cheers

[This message has been edited by Johns 4.9 (edited 04-05-2019).]

Spadesluck APR 05, 03:16 AM
Subscribed...

Got a picture of the trunk closed? Curious how far out that thing sticks.
Johns 4.9 APR 05, 04:41 AM
Not too far.
engine man APR 05, 09:21 AM
I love it way to go outside the box it looks nice and clean not all cluttered again nice job