Blow through SU Carb.IT WORKS

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GARRICK.CLARK
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Blow through SU Carb.IT WORKS

Post by GARRICK.CLARK » Mon May 29, 2017 11:59 am

So Guys , does anyone have any how too tips/pics on blowing through a HS8 SU Carb.
I've got some info on the basics but could do with chatting to someone that's done it
Regards G.C
Last edited by GARRICK.CLARK on Sat Sep 30, 2017 12:12 pm, edited 1 time in total.

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panel
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Re: Blow through SU Carb pics/tips

Post by panel » Mon May 29, 2017 6:26 pm

Why blow through ?

GARRICK.CLARK
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Re: Blow through SU Carb pics/tips

Post by GARRICK.CLARK » Tue May 30, 2017 11:52 am

I've tried DRAW through. It did work to be fair, but lots of fuel sits in the turbo, hard to start,
My turbo has no carbon seal , I would need to spend a load on a carbon sealed turbo, re design the exhaust for turbo to fit etc.

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69yellowbug
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Re: Blow through SU Carb pics/tips

Post by 69yellowbug » Tue May 30, 2017 5:32 pm

Id also like to know. I am building a mild 1776 amd want to do a small boost to it.

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69yellowbug
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Re: Blow through SU Carb pics/tips

Post by 69yellowbug » Tue May 30, 2017 5:32 pm

.

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GARRICK.CLARK
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Re: Blow through SU Carb pics/tips

Post by GARRICK.CLARK » Fri Jun 02, 2017 11:52 am

So , I've been looking into the how to blow through an SU HS8.
To Get it to work I had to
Seal the butterfly shaft either end with an O ring.
Fit an O ring under the jet guide
Fit a boost ref port in the float bowl lid.
Fit a pilot tube into the boost pipe at the carb mouth to give the float bowl more pressure than the rest of the carb is getting.
WITH OUT THE PILOT TUBE ON BOOST FUEL ENRICHMENT WONT HAPPEN AT ALL.
Last edited by GARRICK.CLARK on Sat Sep 30, 2017 12:08 pm, edited 2 times in total.

GARRICK.CLARK
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Re: Blow through SU Carb pics/tips

Post by GARRICK.CLARK » Fri Jul 07, 2017 1:50 pm

little up date . Had to wait a month to get the butterfly shaft grooved for some O rings. Some shops are real slow doing work. Not good.
I have the motor running now. Got the small vent hole on the SU float bowl lid blanked off.
Then drilled and tapped the lid for a boost feed. 1/4 barb fitting with 8mm barb end.
Last edited by GARRICK.CLARK on Sat Sep 30, 2017 12:34 pm, edited 2 times in total.

GARRICK.CLARK
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Re: Blow through SU Carb pics/tips

Post by GARRICK.CLARK » Thu Aug 10, 2017 4:13 pm

Hey Guys. has anyone done blowing through an S.U .
I'D like a chat with someone that has.

GARRICK.CLARK
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Re: Blow through SU Carb pics/tips

Post by GARRICK.CLARK » Sun Aug 27, 2017 1:25 pm

No reply's.
Iooks like I must have the only blow through SU carb motor on this site.
Got it all running now had to do so some more carb tricks on it, e.g put a restrictor at the carb mouth so the pressure that feeds the float bowl is higher than the rest of the carb .( The float bowl pressure feed is taken from a feed that is before the carb mouth). Had to put a heavy dash pot spring in too to stop the piston rising to quick.

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petew
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Re: Blow through SU Carb pics/tips

Post by petew » Sun Aug 27, 2017 11:43 pm

Only blow through SU I've ever seen...

https://www.youtube.com/watch?v=xtnGItldQWA

Mini metro turbo carb.

GARRICK.CLARK
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Re: Blow through SU Carb pics/tips

Post by GARRICK.CLARK » Mon Aug 28, 2017 3:18 am

Hi Pete. Yeah your right the metro turbo has an SU , but its a lot different to my carb and are rare as hens teeth.
Hopefully when I drive it to the MOT station it will work out good .

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Re: Blow through SU Carb pics/tips

Post by GARRICK.CLARK » Sat Sep 30, 2017 12:02 pm

Got it running good now. Had to fit a PILOT tube in the boost pipe to make the float bowl have more pressure than the rest of the carb. Now it goes rich on boost. With out this you will NEVER get it to richen up under boost.

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