Using a gutted Holley 4bbl as a TBI?

MSVega · Post by **MSVega** » Tue Oct 04, 2005 9:57 am

I'd like to MS my Mustang, but I'm going for a psuedo-vintage look for that car, and a Holley carb would fit the bill nicely. I think I've heard of people turning Holleys into TBI units, and that's what I'd like to do for this car. I know Holley makes TBI units (too expensive for me), but I'd rather DIY with a broken Holley and some junkyard injectors from something like a Lincoln Navigator. I assume I'd have to also fit the Holley with a TPS? Have you heard of such a thing? Any ideas/links?
Thanks
Kyle

danielbal · Post by **danielbal** » Tue Oct 04, 2005 10:41 am

I'm going for a psuedo-vintage look for that car, and a Holley carb would fit the bill nicely. I think I've heard of people turning Holleys into TBI units, I assume I'd have to also fit the Holley with a TPS? Have you heard of such a thing? Any ideas/links?
Thanks
Kyle
I too have a question about this. I’ve seen the link where someone gutted their carb, took off float bowls etc. Why couldn’t you leave the whole carb intact? As long as there is no fuel line connected and you fit a TPS I can’t see any issues. Of course I’m wrong about three times a day so that is why I’m asking here.
Daniel Bal

Posted by email.

Karch · Post by **Karch** » Tue Oct 04, 2005 11:27 am

I am in a very similar situation. Are you sure you are talking about TBI, as in throttle body injection?

I am looking into port injection with my Holley carb acting as the throttle body, and I have finally fabricated a bracket and TPS to mount to it, but I do not use a choke.

Karch

BottleFed70 · Post by **BottleFed70** » Tue Oct 04, 2005 11:29 am

A few different people have converted their old holley carbs into a throttle body, but I've never seen anyone machine the carb for injectors like a TBI unit.

eliotmansfield · Post by **eliotmansfield** » Tue Oct 04, 2005 11:44 am

I converted a holley into a throttle body for port injection.
details here:
http://www.mez.co.uk/ms2.html

Try to find one with mechanical secondaries, otherwise you will need to make a linkage up like me.

Also consider the autonomics body, very cheap (although ive heard they have run out of them)

http://www.auto-nomics.com/cgi-bin/show ... 0850-002-D

danielbal · Post by **danielbal** » Tue Oct 04, 2005 12:10 pm

I too was talking about using the Holley as a throttle body for a port injection engine.

Posted by email.

danielbal · Post by **danielbal** » Tue Oct 04, 2005 12:14 pm

Thanks Eliot, yours was the page I looked at. Why remove all that stuff? It would look better (imho) with the metering plate and float bowls still intact.

Posted by email.

eliotmansfield · Post by **eliotmansfield** » Tue Oct 04, 2005 1:32 pm

Because i didn't want all that junk in the way.

You should be able to leave everything in place. But remember i went round blocking and blanking all the holes that lead to below the throttle plates.

donjr5 · Post by **donjr5** » Sat Oct 22, 2005 5:42 am

It doesn't look like a Holley 4BBL, but the GM TBI still looks pretty retro. You can use your factory Mustang air cleaner on top of it.

chris_the_rat · Post by **chris_the_rat** » Sat Oct 22, 2005 3:02 pm

This is what my Holley looks like after "cleaning". Going to be using it in a port injected Chevy. http://www.djupdalen.se/megasquirt1.htm
The TPS is from a TBI unit

BR / Christian

Unkl Ian · Post by **Unkl Ian** » Mon Oct 31, 2005 5:38 pm

Couldn't you leave the vacuum secondaries hooked up ?
I would think they'd work as well as on a regular carb.

Small primaries for off idle drivability,secondaries open when needed.

eliotmansfield wrote: Try to find one with mechanical secondaries, otherwise you will need to make a linkage up like me.

eliotmansfield · Post by **eliotmansfield** » Tue Nov 01, 2005 12:32 am

Unkl Ian wrote:Couldn't you leave the vacuum secondaries hooked up ?
I would think they'd work as well as on a regular carb.

Small primaries for off idle drivability,secondaries open when needed.

eliotmansfield wrote: Try to find one with mechanical secondaries, otherwise you will need to make a linkage up like me.

I think it's more about keeping the intake velocity up to aid fuel mixing, which is less of (isn't) a problem with port injection.

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