cooling the inlet charge

K4000JB · Post by **K4000JB** » Thu Dec 04, 2008 9:23 pm

hi guys just a thought anyone any ideas on injecting fuel into the inlet track 300mm or more before the throttle butterfly to cool the inlet charge on wide open throttle
cheers

HairbearTE · Post by **HairbearTE** » Thu Dec 04, 2008 9:57 pm

You'd have to keep gas speed high, What kind of inlet manifold are we talking about? I guess it could be done successfully with long straight trumpets like the stacks you find on a hilborn injection system for example, but without a strait shot and good gas speed you'd have a risk of fuel coming out of suspension. What's wrong with using the same long runners and injecting nearer the port? I don't think any cooling effect you might achieve by injecting high up will be significant.

topcatcustom · Post by **topcatcustom** » Fri Dec 05, 2008 8:19 am

I think you may get a lot of fuel condensing on the sides of the inlet which puts the injectors efforts at atomisation to waste. On a NA engine I didnt think the inlet had warm issues- if anything its freezing! Longer runners to keep the velocity up should help but I dont think the fuel should be injected too high up- or they'd have done it in the factory and it would be common practice.

chodjinn · Post by **chodjinn** » Fri Dec 05, 2008 9:05 am

Fuel would pool in the trumpet base = BANG. If you want o inject something to aid cooling, use NOS.

K4000JB · Post by **K4000JB** » Fri Dec 05, 2008 5:06 pm

thanks guys i was thinking of injecting fuel only when the throttle was above 80% open to avoid fuel drop out as my two inlet tracks are more than 1.5mtrs long in a very hot engine bay(tvr) i thiught it would help cooling the inlet charge and increase bhp thanks again

spend · Post by **spend** » Fri Dec 05, 2008 5:29 pm

K4000JB wrote:thanks guys i was thinking of injecting fuel only when the throttle was above 80% open to avoid fuel drop out as my two inlet tracks are more than 1.5mtrs long in a very hot engine bay(tvr) i thiught it would help cooling the inlet charge and increase bhp thanks again

PM Pete Humphries he did it last year and might share his experiences with you.

K4000JB · Post by **K4000JB** » Fri Dec 05, 2008 5:36 pm

cheers dave will do

ian.stewart · Post by **ian.stewart** » Fri Dec 05, 2008 5:51 pm

I think the latest Ford Lightening truck was Charged, they used a Charge Cooler via the AirCon, which I think blew cold air thru an air to air closed cooler, it runs for about 30 secs at full bost before it needs to recool its self. Just a thought.