Increasing boost.

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George66Falcon
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Joined: Wed Jul 01, 2015 11:05 am

Increasing boost.

Post #1 by George66Falcon » Tue May 16, 2017 9:06 pm

Hey there folks, I've got a 200 with an m62 blowing through a holley sniper efi system, and I'd like to get a little more boost. Currently, I'm running 7~ lbs (I'm pretty sure my bypass valves never fully close, though, so it might be a bit more after some adjustments). I'd like to get up to 12 or so. The problem is that I don't really want to go much smaller on the supercharger pulley than the ~2.5" double vbelt pulley I currently have. Are there any harmonic balancers that will interchange from larger ford inline motors? My current one is stock, ~6". I see that 300's come with up to 9" balancers! Anything that I can use?



67Straightsix
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Joined: Mon Sep 01, 2014 3:46 pm

Re: Increasing boost.

Post #2 by 67Straightsix » Tue May 16, 2017 10:47 pm

Sounds like a nice set up, have any pictures ? You need to be careful about the harmonic balancer if you go much bigger in diameter it will interfere with the water pump pulley. Are you using the same belt to run blower, alt, and water pump?



pmuller9
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Location: Olympia, WA

Re: Increasing boost.

Post #3 by pmuller9 » Wed May 17, 2017 12:16 am

The M62 should not be run past 14,000 rpm.
I think you would be pushing it past it's limit if the drive ratio was set up for 12 lbs of boost

You may need to look for a M90.



George66Falcon
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Joined: Wed Jul 01, 2015 11:05 am

Re: Increasing boost.

Post #4 by George66Falcon » Wed May 17, 2017 1:41 am

Here's a couple of pictures of what I've set up. Different and undoubtedly worse than what most others have done ( I was restricted to working on the side of the road with only a drill for a power tool when I built everything initially, and haven't really been willing to rework it all). I understand some things will need to change to safely run more boost, an intercooler specifically. The water pump pulley has an additional pulley bolted over the top of it from a 302 that's slightly larger. This 2v pulley drives a modified alternator pulley on the supercharger that is 2 5/8".

I'm happy to hear feedback, whatever it may be.



Image

Image



pmuller9
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Joined: Tue Aug 06, 2013 12:33 am
Location: Olympia, WA

Re: Increasing boost.

Post #5 by pmuller9 » Thu May 18, 2017 1:06 am

Clean looking set-up! Not bad for a hand tool fabrication project.

In order to get 12 lbs of boost from the M62, it would need a drive ratio of 3:1
That would require an 7 7/8" crank pulley with the 2 5/8" supercharger pulley.
The M62 14K max rpm would restrict the engine rpm to about 4800 rpm and the supercharger would run very hot at those limits.

A M90 would only need a drive ratio of 2:1 to get 12 lbs of boost.
The M90 12K max rpm would allow the engine to operate up to 6000 rpm.
It would run much cooler just below 5000 rpm than the M62.



67Straightsix
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Joined: Mon Sep 01, 2014 3:46 pm

Re: Increasing boost.

Post #6 by 67Straightsix » Fri May 19, 2017 11:53 pm

Looks good. :thumbup:



George66Falcon
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Posts: 31
Joined: Wed Jul 01, 2015 11:05 am

Re: Increasing boost.

Post #7 by George66Falcon » Sun May 21, 2017 3:58 am

Thanks for the info, folks. It sounds like my best bet is to either swap to an m90, or make sure everything is sealed nice and tight to make the most of what I've got.



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