10,000hp from the Top Fuel Hemi
Posted: Thu Oct 10, 13 1:41 pm
Interesting about the firing order.
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10,000hp from the Top Fuel Hemi
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Interesting about the firing order.
Posted: Thu Oct 10, 13 4:07 pm
That is interesting about the firing order,would like some more info on whats
involved and how it makes more power but guess its all top secret.
involved and how it makes more power but guess its all top secret.
Posted: Thu Oct 10, 13 4:41 pm
Crank, cam and distributor (if used) would have to be custom made.
Posted: Thu Oct 10, 13 7:06 pm
We've been running a 18736542 firing order on Badbird for a few years now it's just a different cam as the pistons are still in the same position relative to crankshaft rotation just that the power stroke becomes the intake stroke, same if you swap 2 & 3 around. It's nothing new, was used in pro stock a long time ago. Various theories out there about the logic behind it including harmonics & parasitic power losses. It's worth a small percentage of free power which when you are already extracting thousands of bhp which can be significant, for a street or even sub 1000bhp strip motor it would be an expensive waste of time.
Dave, you just swap the HT leads over (might have to buy new if they don't reach!)
Dave, you just swap the HT leads over (might have to buy new if they don't reach!)
Posted: Thu Oct 10, 13 7:21 pm
Very useful, Rob 
Posted: Fri Oct 18, 13 2:49 pm
Regular car HP can be more effectively tuned by combining relective waves in the exhaust. That means tuning header pipe lengths and bend positions so as to interact with the ajoining pipes pulse waves at a specific time.
They cannot have changed the firing order in order to optimize reflective waves in the TFX since the exhust ports are all independant. Therefore it must be either a harmonic or force equalization issue to keep cranks alive longer under the extreme forces. I doubt the engne is making more power because of the change of firing order, I suspect the firing order has been changed to address an issue created by making that much power.
They cannot have changed the firing order in order to optimize reflective waves in the TFX since the exhust ports are all independant. Therefore it must be either a harmonic or force equalization issue to keep cranks alive longer under the extreme forces. I doubt the engne is making more power because of the change of firing order, I suspect the firing order has been changed to address an issue created by making that much power.
Posted: Fri Oct 18, 13 5:16 pm
Yeah realised that cock-up just after writing it while at work and then completely forgot to edit it after.shovelheadrob wrote:Dave, you just swap the HT leads over (might have to buy new if they don't reach!)
Just me going round the twist. Nothing new.
Posted: Fri Oct 18, 13 6:12 pm
I'm with James on this cause he is far brainer than me.. and it sorter makes sence ...
Posted: Fri Dec 06, 13 1:22 pm
Ah see Dave I leave for a few years and come back to find that absolutely nothing has changed.. 
Posted: Fri Dec 06, 13 3:56 pm
Well I still have my looks and you don't have the hair. 
Posted: Fri Dec 06, 13 4:03 pm
Dave just for you mate
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Posted: Fri Dec 06, 13 4:06 pm
I said I still have my looks. I didn't say they were any good.
Posted: Fri Dec 06, 13 5:14 pm
Ah Mr Robson I have soooooo missed our little chats! But on the subject of top Fuel I now know how John force won all those championships- very subtle and completely undetectable !
Posted: Fri Dec 06, 13 5:56 pm
Hydrazine?
Nah, the green flames would have given the game away... come on then, spill!
Nah, the green flames would have given the game away... come on then, spill!
Posted: Fri Dec 06, 13 5:59 pm
funnily enough IF you are smart enough to put a catalyst in the exhaust the flame will match the other car and no one will be any the wiser...
Very very sneaky indeed. but no not hydrazine, you can't tamper with the fuel, it all happens inside the motor.. Private email on this one though sir !
Very very sneaky indeed. but no not hydrazine, you can't tamper with the fuel, it all happens inside the motor.. Private email on this one though sir !