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Carburetor spacer

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Hi

 

Assembling the engine with inlet manifold and carbs, I wonder what the purpose is for these spacers between carburator and inlet manifold.

Thottle and manifold bores are both 40mm, whereas the spacers are tappered from 37mm to 40mm.

 

To me they seems to act more as a restrictor!

 

Anyone who can shed some light on this?

 

Lars

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Thottle and manifold bores are both 40mm, whereas the spacers are tappered from 37mm to 40mm.

 

To me they seems to act more as a restrictor!

 

Anyone who can shed some light on this?

 

Lars

This was done for emmisions, removing the tappers will improve performance slightly :-)

Cheers,

John W

http://jonwatkins.co.uk

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You sure they arnt the anti reversion plates?

 

Buddsy


 

"Belief is the enemy of knowing" - Crrow777

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Thanks for your replies.

 

Anti reversion plates? Interesting!

Never seen them on an intake, but in exhausts.

 

Thanks

Lars

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I think they help increase velocity and stop reversion of the gasses at high rpm on overlap. All I know is I knew which way round they were meant to go and when I rebuild my engine...when I had trouble getting the engine to rev above 3000rpm I suddenly remembered and knew I had put them in arse about face!. Turned em around and all was fine!

 

Buddsy


 

"Belief is the enemy of knowing" - Crrow777

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I didn't realise these plates where different one side to the other! Which way around do they go?

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Sharp side into the engine, away from the carb.

 

Buddsy


 

"Belief is the enemy of knowing" - Crrow777

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Thanks - I took the problem carb (no vacuum) off and the spacer was the right way around, which is a pity as I thought I had found the problem. The rubber seals don't look great, so perhaps there is a leak. I might swap out the spacers for some Misab seals and see if it improves the vacuum. A cylinder with poor compression wouldn't just effect the 2 inlets on one carb and provide constant vacuum to both on the other carb, so I'm not too worried it's a compression issue. Could be tappets but was running fine before I replaced all the fuel system and rebuilt the carbs, so doubt that too.

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