|
That's some serious mumbo from a NA donk of that capacity Phil. Credit to you mate!
I'll be watching the mirrors at ShelbyFest %/ Cameron |
For the ET the Top Speed seems a bit on the low side. I would have expected high 120's. 125 at least. I would think.
Hey it's a great run, well done, just contemplating the numbers and what it all means... Really good numbers to the 1/8th mile, seems like it falls off a little toward the end run, save the bottle for 3rd or 4th gear. Of course ET is what wins races, just speculating on how to get there quicker. |
Wow!
Mitzy,
What can I say? I'm blown away! :eek: Great effort! Stef :3DSMILE: |
HI Excaliber
"save the bottle for 3rd or 4th" Not sure what you mean but I have not used the NOS yet and probably wont untill I get 10.99 or quicker NA. There is more Top speed, and that is some of the reason for the dyno session, towards the end of the run I flatten off as I am about to hit the rev limiter, to fix that I have set it higher. Phil |
Sheesh...
355odd kws!!! Thats some great power. Is there a thread with your engine specs? |
Engine specs
HI HVSREDSLED,
The engine is a 4 bolt Dart Iron eagle "302" block with the 4 1/8 inch bore. The crank is an eagle stroker giving the engine a 369ci capacity. Forged rods, CP pistions custom ported Dart Pro 1 heads. Solid roller cam. 1.6 crane rockers. DC@O 50mm 8 throttle body manifold, 1 3/4 primaries stepped up to 2 inch then in a 4 inch pipe with a 2 1/2 inch perforated tube. The fuel system is overkill and the engine breath thru the bonnet scoop. Motec M48 runs the engine and an MSD 6A ingnition for spark. The static compression is 11.5 to one but some of that is bleed off by the cam. There is actually not one Ford made part in the engine:3DSMILE: I am using V power (shell) but may switch to BP Ulimate. Phil |
Save the bottle for 3rd or 4th. In other words, use the NOS after the 1/8th mile as that seems to be where you really need the power.
As I recall the near stock ET times for a 289 Cobra and a 427 Cobra were both in the low 12's. The 427 was faster, but not by 'that much'. But the top speed (trap speed) of the 427 was significantly higher than the 289. Small blocks wind up fast, good hole shot, good 1/8th mile times, but tend to run out of breath toward the end of the 1/4. Cars like the "Dragon Snake" 289 Cobra were full on drag race setup with ultra low rear gear ratio (5 something) and did run in the 10's, naturally aspirated! |
Quote:
Good luck tonight Phil. Have fun. :) |
I know Phil isn't using giggle gas, so this doesn't apply to him.
Using NOS after half track (or in the higher gears) is pretty much a waste of time. Granted it will drop your ET by a small margin, the only real improvement will be in trap speed (which means virtually nothing)... You would be much better off using it to half track then switching it off (though it's better to just leave it on). |
Why would you put gas on an engine and not use it from start to finish? He may have to not use it on the line to save the drivetrain.
|
Well typically you don't use NOS 'out of the hole', traction is one problem and stress on the motor is another. Man I'd be scared to use it the whole way through the 1/4, isn't that pretty hard on the motor?
So given a choice, seems logical to use where you really need the power boost, in this case the last 1/8th. But I hear you Plums, it might not make a lot of difference in the last 1/8th. |
The only way to go quick is to have the gas on from the start line. As you have rightly mentioned you will need good traction to achieve this. A lot of N2O systems are multiple stage. You might launch with 150 of gas then increase to 250 when you hit second gear.
I'm not personally a big fan of funny gas because when things go wrong, they go wrong big time. If anything goes wrong in the fuel circuit, your motor is lunched, same deal for detonation. I have seen lots of bent rods, holed pistons and hammered bearings.... |
Ahhh Plums...
It all comes down to this: No Pain, No Gain... :LOL: :LOL: :LOL: That's the gas making me laugh so much :p Cameron |
Use protection.
Nos is not to be taken lightly.
I have a totally separate fuel system for my Nos set up. It has its own fuel tank, fuel pump and regulator. I also have a bottle warmer and purge valve. http://www.clubcobra.com/photopost/d...538_Large_.JPG http://www.clubcobra.com/photopost/d...563_Large_.JPG http://www.clubcobra.com/photopost/d...541_Large_.JPG The installation was much more than I expected in complexity and cost, but as I have been told ther is only one way to install NOS and that is to take no chances. The engine is absoultely up to the task, however a lean run will destroy the engine. The NOS is triggered by the throttle position, and at 90% the solenoids open. This will all be tested on a dyno before I will use it on the track |
A quick squirt on the dyno is absolutely the best thing you can do. This way you can discover any lean conditions BEFORE you end up with lightweight pistons...
Bloody nice set-up there Phil, very nice indeed!!! :) |
Phil do you sleep with that tank ?
You run the nos from start to finish, you dont take off with your foot flat but you flatten it when you've left the line so thats why you run a trigger on your throttle linkage which activates at full throttle. Why improve power half track when you can improve from the start, and a well built engine with all the right gear should love it. |
An engine built for gas will go all day long. Its the things like blocked nozzels and bad fuel pumps that cause the problems. Philm will certinly feel the difference when he turns on the gas.
How much gas are you going to run? |
Filled my Pants
Had a run last Wednesday and things were not so good the engine began to run rough and developed a miss that was something it has never done.
I had a run and the car was a slug. Checked things over and though I may has stuffed the plugs with a leaner tune. Decided to have another go and it was not real good. Put the car on the trailer and headed home. This morning I removed the rocker cover and this is what I saw. :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: http://www.clubcobra.com/photopost/d...m/P1100361.JPG After I changed my cloths%/ I had a good look and everything looks ok and the thread is fine, I think when I last set the lash I may have turned the stud and then it slowly worked itself loose. Phil |
:eek: :CRY: :eek: :CRY: :eek:
|
I used to use Loctite super stud lock on the rocker studs and also put a dob of "anti-tamper" paint on them facing the intake, (so I could see if they were moving).... I did this because a mate of mine with the same motor, (308) used to find loose rocker studs after every meeting.
After using the Loctite we never saw a loose rocker stud again.... |
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