Competition New Dyno Numbers 1020 H.p

[JLackman]

Diesel is slower buring than gas so 21º advance seems like a small amount.



The timing is fixed right, like locked out centrifugal advance in a distributor?



Does nos require lowering timing in a diesel like it does in a gas engine?



A gas engine can be started with over 30 advance, is this a problem with diesels?



Has anyone tried variable timing?

 

[bgilbert]

Diesel is slower buring than gas so 21º advance seems like a small amount.



The timing is fixed right, like locked out centrifugal advance in a distributor?



Does nos require lowering timing in a diesel like it does in a gas engine?



A gas engine can be started with over 30 advance, is this a problem with diesels?



Has anyone tried variable timing?

Oh my, is this another Comp461 in the making :-laf ??

 

[Timbeaux38]

Diesel is slower buring than gas so 21º advance seems like a small amount.



The timing is fixed right, like locked out centrifugal advance in a distributor?



Does nos require lowering timing in a diesel like it does in a gas engine?



A gas engine can be started with over 30 advance, is this a problem with diesels?



Has anyone tried variable timing?

If you use the search function, you will find what you are looking for

 

[Stefan Kondolay]

I have personally seen how much engine dyno's can vary. I just put our engine on a dyno this weekend and it made 891hp and ran 8. 16 @168mph in a 2450lbs car shifting at 6800rpm, then our buddy went to a different dyno and made 940hp and has a 2330lbs car so you would assume that his car would run faster yet it only ran 8. 39 at 165mph shifting at 6800rpm.



Both cars have 4. 30 gears, both cars run 33" tires, both cars have 5900 stall converters. The only difference is one is a roadster and one is a 67 camaro, the roadster looks way more aero-dynamics, so why this result is engine dyno's are so accurate?

 

[Turbo Thom]

On the 12V engine, the timing is whatever you want it to be. You are not locked in like on the 24V. You are timing the pump to the engine. That first spark plug has to fire just right.

 

[Sled Puller]

it really was originally a sled pulling motor too

Built in PENNSYLVANIA, no less!!!! Oo.

 

[JoshPeters]

Built in PENNSYLVANIA, no less!!!! Oo.

I donno if I'd be bragging about that.....



JK sleddy.....



Someday one of us from the Midwest will get some Money and build something... ... just wait... .



Some day...



Josh

(that is if we stop breaking other stuff! :-laf )

 

[HoleshotHolset]

Question #1: The timing is fixed right, like locked out centrifugal advance in a distributor? Question #2: Does nos require lowering timing in a diesel like it does in a gas engine? Question #3: A gas engine can be started with over 30 advance, is this a problem with diesels? Question #4: Has anyone tried variable timing?

Answer #1: Correct; on most mechanical injection injection pumps (like the Bosch P-7100 used on the engine that did the dyno pull in question... ), there is no timing advance (or very little advance... ).



Answer #2: No. We can usually handle the increased cylinder pressures and don't have to worry about running too lean like gassers. If we go too lean, we just make less power. 15:1 A/F ratio would be on the lean side for a gasser and VERY rich for a diesel. Some diesels are running upwards of 85-100:1 A/F ratio at idle.



Answer #3: No - not if you have two cans of ether on hand when you try to start it... even in 100°F ambient temps. I know of a couple pulling tractors in my immediate area that routinely run 55-60° BTDC. Pro-Stockers run 70° of timing.



Answer #4: Variable timing is par for the course on just about any electronically controlled diesel. High pressure common-rail (HPCR) or even HEUI (High Energy Unit Injection - like what is used with a Powerstroke or some Cat engines) injection offer nearly limitless boundaries for timing control. Multiple injection events are also possible with most of these HEUI or HPCR systems (and even some electro-mechanical pumps... ).



Clear as mud?



Matt

 

[COMP461]

I have personally seen how much engine dyno's can vary. I just put our engine on a dyno this weekend and it made 891hp and ran 8. 16 @168mph in a 2450lbs car shifting at 6800rpm, then our buddy went to a different dyno and made 940hp and has a 2330lbs car so you would assume that his car would run faster yet it only ran 8. 39 at 165mph shifting at 6800rpm.



Both cars have 4. 30 gears, both cars run 33" tires, both cars have 5900 stall converters. The only difference is one is a roadster and one is a 67 camaro, the roadster looks way more aero-dynamics, so why this result is engine dyno's are so accurate?

Stephan. I’m sure you are one of the few on here that understand, or soon will when you move up to comp,, the difference in track tune is enormous and the first 60 foot is a great part of that, on how fast you go, your Car is a RJ and the finest money can buy, kind of a waste in SC or SG but you have Comp aspirations, like B/A. the dyno are notorious of being happy of sad , the only thing that really counts id if you use the same dyno , and run you air corrections , to tune a given combination, I will not dyno on a rainy day , because the corrections will not make up for the difference in vapor pressure.

What I and others believe is you use a dyno to learn, and tune , not to produce numbers to post on here. I know what Rays Dyno number will correlate in to on track times, David Dunbar has a correlation as to what his numbers will produce on a track, but if you don’t do exactly the same procedures ever pull, then all you are getting is numbers to brag about.

 

[Timbeaux38]

your Car is a RJ and the finest money can buy, kind of a waste in SC or SG but you have Comp aspirations, like B/A.

So what if you have an STD and you are into RC? :-laf

 

[Tcolesanti]

Then you have KP for the remainder of the week, says so in the POW. :-laf :-laf