TBI adapter question

JimIsbell · Post by **JimIsbell** » Fri Aug 31, 2007 3:31 pm

I am down to the last part needed to do my installation and I have a question. I need an adapter fro the GM TBI to the QuadraJet manifold. I have seen two kinds on ebay. One has a water inlet and outlet to stabalize it at engine temperature. Is this needed for southern climates where the car will never be run at temperatures below freezing. If it needed, why do the others NOT have that capability?

This is for a GM TBI with two 55 lb/hr injectors mounting on a GM 229 V6 being run on the gulf coast.

JimIsbell · Post by **JimIsbell** » Sat Sep 01, 2007 6:43 am

Thanks. Thats what I needed yo know.

78Spit1500Fed · Post by **78Spit1500Fed** » Fri Sep 07, 2007 5:11 pm

I never understood that logic either... I must be wrong, but I would think that by the time the coolant is warm enough to warm the incoming air, the engine is warm enough to not require warmed incoming air!

The exhaust manifold is almost instantly hot; a much better source for warm air IMHO! My Spit came with a bi-metal manifold-warmed inlet... neat little piece of engineering.

-Brian

Jack · Post by **Jack** » Fri Sep 07, 2007 5:30 pm

78Spit1500Fed wrote:I never understood that logic either... I must be wrong, but I would think that by the time the coolant is warm enough to warm the incoming air, the engine is warm enough to not require warmed incoming air!
-Brian

Highway cruising in the right conditions, not necessarily below 32Ã‚Â°F, can ice up a carb or TB.

Think venturi and the drop in temperature due to expansion of the gas.

Jack

JimIsbell · Post by **JimIsbell** » Fri Sep 07, 2007 7:51 pm

But in a TBI, there is no venturi. Its not needed to create the vacuum to pull the fuel from the float bowl. Its just a straight hole!