NOS and blown alcohol ???

Just your thoughts.

 

Enrich with gas. lots of guys around here play with it. it usually ends up a futile experience.

put a better blower on it if you need more cylinder pressure.

 

I was just bored and thinking out loud. My crew cheif has already shut me down.
But I was just wondering if anyone has tried it.
Kenny

 

Yup. I've seen a couple that way.

 

Yup, it's doable but let me say this. You have enough trouble.

 

just turn up the overdrive !

 

a friend of mine just put it on his blown door car supposed to be bad ass i havent seen it run but there are several out there in pro mod doing it

 

There are quite a few guys doing this in the Pro Mod stuff. Actually a few I know pretty well. Its mainly done through the hat, and used as mainly a way to cool the charge as it hits the manifold. It does help and makes a decent sized gain in performance, it just depends on how much you want to spray.

 

Are these screw blown Pro Mods? I could see that, along with the chilling of the fuel helping on a roots blower motor, but in a general Top Alcohol screw blower setup, you're building ice on the injector with nothing more than the methanol.

 

That's correct. But the blower outlet temp at idle is anywhere from 85-100 degrees, and depending on the fuel volume being run through the blower, overdrive, and rotor clearence, the outlet temp at the end of a run is anywhere between 135-160 degrees. I always advise my customers to have at least one blower outlet temp sensor directly under the discharge outlet of their supercharger. It will let you know if you are lean through the blower and other fuel delivery problems; A LOT sooner than without the temp sensor. So using nitrous on a screw blown application is definetly beneficial.

 

That makes sense. Just out of curiosity, what about the port nozzles? Is it well known what effect, if any, the fuel coming in the actual intake ports has on the air charge temp as it enters the head and CC? It would seem like it would cool it, but to what extent? Sorry if it seems like a stupid question, just an inquisitive mind.

 

Good Question

Justin , the intake temperature is the same or slightly higher than in the runner . Friction and Heat absorption is the reason for it to alter , the friction from the air turbulence and flow disruption around the nozzle is part of the reason it doesn't cool more . Indexing , Down nozzles and insulators are all
great power adders that are often overlooked for their gains, yet nozzles take up surface area for air to move , disrupt air and fuel to the valve and create or maintain Temperatures higher than necessary. I have had success doing all of these as others have before me .... they can be costly , but the return is that 98% of those you compete against won't do it because it doesn't come in a box or they haven't "tried it" .

Les Mellows

 

I'm sure Good cylinder head people such as Carl Foltz and Darren Morgan would have a pretty good idea as far as the temp change in the port itself. We have done just about everything under the sun on the dyno, except for measuring true intake temp at the valve seat. I know it can be done, but would be very costly.

 

And to be completely honest. The only stupid questions are the ones not asked! That is one of the only ways to learn. To ask questions, and try to get hands on experience.

 

Thanks guys!

 

Les Mellows

I was going to down nozzles but I called Jim Rehfield (Enderle) and he convinced me not to. He had problems banging the blower and wasn't sure why. Seems it worked fine when it showed a rich mixture but than some leaning and it would bang...
Are any of you using down nozzles on blown alky chevys?
I just don't want to be banging blowers so any advice on why or how to avoid this would be appreciated.

Les, on the indexing I'm assuming you mean to make sure the deflector directs the fuel towards the valve or not?

Les, what's the insulator thing about?