intake manifold/ carb question

Moderator: Dietmar

intake manifold/ carb question

Postby jmattox » November 17th, 2013, 11:31 am

Thanks to a friend I have a really good engine, but I feel it is asthmatic due to intake manifold and carburetor. Any "inexpensive" way of "improving" the flow on my manifolds. Thanks,

John
FV42
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Re: intake manifold/ carb question

Postby Dietmar » November 17th, 2013, 9:28 pm

John:

First find out what you have.

Flow tests on carb/manifold combinations are not expensive.

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Re: intake manifold/ carb question

Postby jmattox » November 18th, 2013, 9:49 am

Next race is in 2 weeks, not enough time to "improve" for that. I will send manifold and carb for flow testing to you after Turkey Trot. Any suggestions on improving flow that I might be able to do myself? Thanks

John
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Re: intake manifold/ carb question

Postby Dietmar » November 18th, 2013, 12:47 pm

John:

Unfortunately, no. There is little that you or I can do to improve flow on a manifold. That is something that I leave to a select few.

We'll assume that the carb is jetted correctly. That will definitely affect HP .
Make sure that the gasket under the carb has a larger hole than the manifold- carb itself. Some gaskets are too small. Also be sure that you are NOT using the stock intake gaskets- they crush and will reduce flow. Use hard copper or Teflon gaskets at the head.

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Re: intake manifold/ carb question

Postby hardingfv32-1 » November 18th, 2013, 1:08 pm

jmattox wrote: Any suggestions on improving flow that I might be able to do myself? Thanks


You can learn to acid etch the manifold for yourself. I would be glad to provide info on the process. You will need a couple of cores and 40-120 hrs of time to get the process down.

Brian
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Re: intake manifold/ carb question

Postby brian » November 18th, 2013, 5:27 pm

If you have access to a glass bead maching a good internal cleaning will help vertually all manifolds since they're prone to rusting. Be sure to rinse out the manifold with brake clean afterwards. If the carbs are crudy, a bit of spray cleaner down the throat can't hurt either.
The above post is for reference only and your results may vary. This post is not intended to reflect the views or opinions of SCCA and should not be considered an analysis or opinion of the rules written in the GCR.
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Re: intake manifold/ carb question

Postby jmattox » November 24th, 2013, 10:21 am

hardingfv32-1 check your PM

John
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