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cooling the inlet charge
Posted: Thu Dec 04, 2008 9:23 pm
by K4000JB
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
Posted: Thu Dec 04, 2008 9:57 pm
by HairbearTE
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.
Posted: Fri Dec 05, 2008 8:19 am
by topcatcustom
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.
Posted: Fri Dec 05, 2008 9:05 am
by chodjinn
Fuel would pool in the trumpet base = BANG. If you want o inject something to aid cooling, use NOS.
Posted: Fri Dec 05, 2008 5:06 pm
by K4000JB
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
Posted: Fri Dec 05, 2008 5:29 pm
by spend
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.
Posted: Fri Dec 05, 2008 5:36 pm
by K4000JB
cheers dave will do
Posted: Fri Dec 05, 2008 5:51 pm
by ian.stewart
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.