I have some wild ideas running around in my skull, but top fuel is brand new territory to me...

 

With those huge 'jimmys' on there, I'd guess somewhere in the 6:1 - 7:1 area.

 

Yeah, but with the stuffer factored in - what IS the pressure in there?

Last word I remember was 8:1 with 10PSI from the blower for ALKY.

I don't know anything at all about nitro fuel.

On ALKY - it stands to reason that 15psi (sea level) plus 10 = 25.

25 X 8 = 200PSI

Sound real?

 

Here is some good reading. Compression ratio is around 6.5:1
http://www.answers.com/topic/top-fuel
http://www.hondaprelude.to/forums/sh...ad.php?t=63701


Stryder

 

3.8 to 4.5 bar = 3.8 to 4.5 X 15PSI

Scuse me a moment....

67.5PSI from the blower

times, umm...

6.5?

438.75 PSI compression.

Is this right? Does it look that way to you?

4.5 X 15PSI X 6.5 = 438.75

3.8 bar X 6.5 = 370 and change....

Around 400 psi, roughly.....

430 divided by 15PSI is about 28 2/3 to one compression....

(Sloppy math, I know)

300PSI is about normal for diesels.

 

Not quite, but close.
1 bar = 14.5037738 pounds per square inch.
So 4.5 Bar = 65.2669821.
65.2669821 x 6.5 = about 424.24psi


Stryder


Edit: Just realized I part the 500 post mark. Cool
That only took 6 yrs.

 

Someone check me on that - I'm not sure I believe it.

 

Just did, but you posted while I was editing


Stryder

 

RIGHT ON, thank you, and CONGRATULATIONS BUDDY!!!!

So, it's in the ballpark, and obviously if you wanted to run either-or you would want to "BELT UP" or "BELT DOWN" the blower drive using pulleys...

ARAGORN! You just made my whole day. I'm considering building something SEISMIC...

 

I would believe it. Those top fuel thingys produce so much horse power that it is basically immeasurable by a mechanical device and can only be estimated. They are producing 4000+ HP at what, 8000 RPM, not much trouble for a big blower like that to produce 65 PSI; I'm sure there's plenty of reduction gearing in the blower drive gearing to make them spin unbelieveably fast.

 

Nevermind, I took too long.

 

What do you have in mind???
By seismic, you mean I can feel the engine explode clear over here in Iowa? COOL! I'm in!


Stryder

 

Well - you figure top fuel has all been about the really gigantenourmous engines so far, but a V6 just might could be built for a smaller chassis.

If it was to a top fuel build ideation it might could kick some serious backside....

And then there is FOUR WHEEL DRIVE to spread out some of the horsepower!

I don't prezactly know yet, I'm still kicking ideas back and forth.

- But YES it will be a Ranger II truck.....

 

Actually, most RC engines run on a Nitro mix, and they are pretty small. I havent found an Octane rating for Nitro yet, but I can tell you it can be VERY explosive in the right conditions. Especially 100% pure. Dont quote me on this, but I can remeber somewhere that you some dirt track/ and drag racers run a small % of nitro in their fuel. I think its under 10%. Not completely sure though. I'll keep digging and keep ya posted.


Stryder

 

Them suckers is runnin' 85%.

Just once in my life, I kindee wanna go there.....

SHO as I'm settin' here!

Have you ever had a dream that you one day thought just might come true?
It's strangely like that.