I thought I read where a member had his stock SC pulley machined to a smaller diameter. What diameter and what machine shop? It was under $200. Was this size sturdy enough? Info would be nice, Mark

 

Yes, me. https://www.crossfireforum.org/forum...ck-pulley.html

 

a few have done it. I did it on a pulley for my SL55. GripGrip did it a couple of times for his SRT6 (took him at least 2 times to get it right ). I think the limit is something larger than 65. Keep in mind that the minor diameter defines the pulley. If you are thinking something in the 65 range, better to find a steel code3 rather than mess with machining.

Cheers,
Chris

 

Minimum diameter for stock pulley is 67mm (if you keep the groves 3.5mm)

 

[QUOTE=latemodel21;837076] If you are thinking something in the 65 range, better to find a steel code3 rather than mess with machining.
]If you are thinking something in the 65 range, better to find a steel code3 rather than mess with machining.
Chris I am so glad you said steel pulley,, as we know the aluminum ones aren't that good,,. the rivets when riveting steel to aluminum will not last jim

 

I've got a 64.7 from EURO that I am happy with. I just cannot find that thread, only curious.

 

stainlee steel or Al?

 

[QUOTE=amx1397;837097]Jim, i already have a 64.7mm pulley from Euro. Just interested in what was done.

 

I had my stock SC pulley machined from 74 mm to 70 mm. This was done at Carrs Machine Shop between Danville and Bloomsburg Pa. Tim is a friend and charged me $60. The limit is about 67 but with a 181 main pulley, 70 was as low as I wanted to go to keep the SC from exceeding the safe limits. Tim Carr is an excellent machinist, he is an instructor at the local Vo-Tech school. This is the same guy who produced my two piece front wheel bolts.

 

For those without a calculator...70/181 is equivalent to 60/155
What WOT psi and IAT you getting at what altitude?

 

Jim, from all of the posting and research I have done it seems that the SC should not spin more than 15,000rpm. So since I have a 178 to put on a 70mm crank pulley would be perfect. That would be about a 5 percent increase over the 155/65. I have seen 18/19 psi with my current set-up with E/C data logging.
maybe I would not need larger injectors with the 70 also. I don't understand how running 550cc inj's would run at a 14.x:1 under normal driving. Would the ECU adjust trims to get to the right AFR's and how long would it take. The fellow I got the pulleys from said he never got his running running with correct AFR's, always rich normal driving.
I'll look into a 70mm pulley now. Thanks guys for bearing with all of the questions, just want to get it right the first time. Mark

 

That would be a good setup and you do not need bigger injectors but the larger pump and adjustable regulator will be a necessity. The ECU will make adjustments within a few short drives, ours is a very complicated and smart ECU. I am at the safe limit with the 181 and 70 mm SC pulleys and WOT see close to 22 psi boost, however, I do not do this routinely.

 

If you directed a couple of questions to me I am at sea level. I have seen 19psi with a E/C Datalog. IAT's are an issue. THe SLK32 does not have room for Rob's heat exchanger. Not sure what I will do. Doc is stacked, well not personally, and runs the stock cooling system though he is not is Southern Florida. I am reinsulating my NeedsWings DCAI to do,a better job and will have to look into something better than the isolation kit I have.
As for the 65mm pulley I have I am not sure about the rivets. I thought aluminum were a thing of the past for American made pulleys but if the shop is successful in turning my stock pulley to 70mm's I'll check out the E/C I bought last fall, less than 4000 miles ago. Maybe I can sell that and that would help with the labor for the 178 and PSK install. I really would like to get into the 11's and am awaiting a response from Mimi05SRT6 as he is consistently in the 11's with modest mods listed.
I want to thank all who have stayed with me as I sTruggled to research and question what experience I could gather, especially from AMX1397, grip x 2, Doc and a couple of others. I am very comfortable with the decieson I made avoiding stressing the SC, my wallet and little sanity I have left. This was for me a for me a forum in action with a couple of guys giving me numbers to call for more lengthy discussions.
I will still need other work to get those consistent 11's.
I have always wondered why dropping the resonator, adding an X-pipe and a Borla Pro XS muffler, cat deleted also, would not yield 20-25hp. Maybe that will be something to try. Thx, I'll keep this pulley change updated. Mark

 

I've asked Eurocharged about turning my stock pulley to a 70mm or getting a 70 made. Jeffasold is my last hope to find a shop that turns these pulleys correctly. That shop grip used has had the phone disconnected. It does seem a 178/65 turns the SC too high and I have no special cooling being I have an SLK32 and it has less room than a Crossfire for aftermarket heat exchangers. Mark

 

Check with Chris ( latemodel21 ) - he turns stuff all the time.
( also makes those scatter shields for the pulleys )

 

I don't know what's the problem with turning down the pulley?!

When i decided to make my stock to 67mm. i take one spare idler (the small one next to the S/C) and use his grooves to make a tool with that angle. After that i remove the pulley of the car and machined it to the desired dimension.

Easy job, and i guess every machine shop with lathe can do it. (atleast here in Europe)

 

I expect most can, after all the US put men on the moon nearly forty years ago, Europe and Bulgaria not yet.

 

Yea, yea....
I see! After all Europe made the US

anyway
a lot of talk and no result... Whats hard of going to a machine shop and give them spare pulley to duplicate the grooves to other pulley?!

somebody have a manliness issue or what?

 

Pretty sure 32Krazy (Steve) with his SLK32 ran a 65/178 up around 22psi, but he'll chime in if feels he has something to offer.
I also recall he was looking at a killer chiller to quell his IAT's as well. Not sure if that was a partial or total success. Can't recall ever hearing about the result.
That was just before he sold the car.

 

I have an issue with a costly pulley being trashed. The first shop was going to try but they said the grooves would not need to be cut AFTER .080" , .160" total diameter. That would have left .045" for groove depth. Then the shop owner said he had some cutting tools for pipe threads. I took the pulley back. It's finding a shop experienced with pulleys who will bother with a small one off job.

By the way, yes Europe made the U.S., in fact my grandparents came from Europe. Then the U.S. saved Europe from Hitler and we support much of Europe with cash and military protection. We work together just as this forum should work together.