How many folk use engine dynos?

[PeterBurgess]

I was wondering how many folk have their engines setup on an engine dyno and do they subsequently have them rolling roaded?

I have been lucky enough to be able to use my rolling roads 24/7 for 25 years so have done most of my development this way. This may upset some 'purists' but such is life

Customers of mine who have used engine dyno specialists speak very highly of the following companies;

http://www.damico-engines.co.uk/

http://www.agraengineering.co.uk/

http://www.massracingdevelopments.co.uk/

Peter

[packman10_4]

When i do a engine for someone esp a turbo motor i use Harvey Gibbs in Peterbrough he has a Superflow jobbie , if its N/A i use Troy at Northampton Motorsport single roller 1000 hp , no wheel spin at all even with a 550 hp LS7 Tuscan on there....

[Evoluzione]

I just get Dave to calculate the outcome and publish that.




















That was a joke btw, just pulling your leg a bit.

[stevieturbo]

If I had one, I probably would use it. But I dont, so I dont lol.

[84Dave]

Finally logged in successfully!

[84Dave]

Peter..... I prefer the rolling road dyno for final break-in & all tuning adjustments. That allows use of the actual race car cooling system, ignition/electrical systems, & exhaust system. Some engine dyno's are so compact that the actual exhaust system to be used can't be hooked up. I consider the actual exhaust to be used just as important as the induction system for tuning & final system torque & power curves. And the rolling road we use has a good wide-band O2 system for tuning. 84Dave

[PeterBurgess]

Some 12 years ago we built a dyno test cell, the first consideration was fitting a full length MGB exhaust system in (mainly do MGB engines)as we fully realised the difference between full system and not. The differences can be amazing even down to what air filter setup was used for dyno session.

We are stunned how fast the afr is recorded on the Dynocom rollers, I attach a pic which shows the effects of richening up the mixture, more power everywhere. The runs took 6 seconds start to finish. Of interest is the richer mix at 3500 still gave more power when the 'text book' would dictate otherwise. We are finding we have to try richer and weaker to see what happens as no two cars are the same with olde worlde carbies and dizzies.

Peter

[roscobbc]

84Dave said:

Peter..... I prefer the rolling road dyno for final break-in & all tuning adjustments. That allows use of the actual race car cooling system, ignition/electrical systems, & exhaust system. Some engine dyno's are so compact that the actual exhaust system to be used can't be hooked up. I consider the actual exhaust to be used just as important as the induction system for tuning & final system torque & power curves. And the rolling road we use has a good wide-band O2 system for tuning. 84Dave

All too frequently hearing the BHP guestimates that so many quote after an engine build I had my 'new' stroker BB Chevy dyno'd. It gave a 'opportunity' for the engine builder to 'prove' engine bhp/torque to me after several dyno runs & break-in. I probably should have used his rolling road dyno after engine install and a couple of thousand miles - whilst engine was 'proved' for max bhp/torque on dyno the fuelling was a little 'weak' in normal road use so carb etc was 'tweaked' the old fashioned way.

[Boosted LS1]

I think I'd prefer a rolling road because that allows for the actual engine installation in the car. We all know engine bays can get very hot, header tanks could have been located in less then ideal places and fuelling could be iffy between the tank and rail. The rolling road is perhaps closer to the real world then a bench dyno. Also, the rolling road session will be with the actual radiator and coolant capacity.

[MFaulks]

Agree, you will always get bigger numbers with a cooler engine, and with a dyno and larger header tanks with quick runs you can bump your numbers... but it's like all instruments or test gear, you can always get it to fool you into believing a number if you want it too.. it’s just a case of being consistent with your method to the point of rigour and even having a written routine you methodically repeat, check your instrumentation, and know the limits of the measurement... or just see how far you can leave black rubber in a straight line Lol!

[roscobbc]

http://www.john-sleath.com/dyno.htm

A word from someone really 'in the know' about how a dyno can 'read' so differently!