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Dyno my motor
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Author:  nomad [ Thu Nov 15, 2012 10:14 pm ]
Post subject:  Dyno my motor

The plan is to mount my engine on the dyno this Saturday. Monday, we'll make some pulls to assess general condition, ie how much power did it loose over 325 passes?

Then we are going to work on a 540 E85 calibration, 2 circuit.

Then we'll freshen it for the coming seasons.

Author:  shrinker [ Thu Nov 15, 2012 10:39 pm ]
Post subject:  Re: Dyno my motor

Hey Ill take a guess make it fun, 27hp

Author:  nomad [ Thu Nov 15, 2012 10:46 pm ]
Post subject:  Re: Dyno my motor

It made 818 when it was fresh.

Author:  Beretta [ Fri Nov 16, 2012 6:49 am ]
Post subject:  Re: Dyno my motor

I have a couple you could try =; =; ...Planing on running a 3 circuit with E85 to test??

Author:  nomad [ Fri Nov 16, 2012 9:40 pm ]
Post subject:  Re: Dyno my motor

Beretta wrote:
I have a couple you could try =; =; ...Planing on running a 3 circuit with E85 to test??


Not really. It's a time issue. I've only got the day. I've got to get this puppy apart to see what has to be replaced besides rings, springs and lifters. Then there's the Carb Challenge and PRI. The new season will be here before I know it..

Author:  nomad [ Wed Nov 21, 2012 9:43 am ]
Post subject:  Re: Dyno my motor

I spent all day yesterday on the dyno, mostly as a neophyte operator. It was my engine and we learned a few things

Anyways, it's down 60HP after three years and 325 passes.

Author:  Beretta [ Fri Nov 23, 2012 8:53 am ]
Post subject:  Re: Dyno my motor

Seems like down alot of power for only 325 passes..
Anyway what's your plans for the freshen up?? I know you had talked about pistons so a bore
in planed? What else...... =;
We had talked about E85 for you but I remember you said you have epoxy in the heads...

Author:  Rodz [ Fri Nov 23, 2012 8:56 am ]
Post subject:  Re: Dyno my motor

nomad wrote:
I spent all day yesterday on the dyno, mostly as a neophyte operator. It was my engine and we learned a few things

Anyways, it's down 60HP after three years and 325 passes.


I would have gussed less than that. 60 is a lot. Did you use the same dyno as 3 yrs. ago. There could be other reasons for the difference. :-k

Author:  Ken0069 [ Fri Nov 23, 2012 9:18 am ]
Post subject:  Re: Dyno my motor

Rodz wrote:
60 is a lot. Did you use the same dyno as 3 yrs. ago.


I wondered about this also as from what I hear, no two dynos will give the exact same numbers.

I also wondered if his ET/MPH numbers backed that up? Crew Chief Pro will give you "estimated" HP numbers for the MPH and weather data you plug in.

Author:  nomad [ Fri Nov 23, 2012 10:13 am ]
Post subject:  Re: Dyno my motor

We used the same dyno. While the compression numbers are good leakdown is way more than I expected. 8% plus in 6 clyinders and 12+ in two others. Mark has a borescope so I've snaked that down all cylinders. I'm not seeing bore wear I expected in the two low cylinders. And there are no nicks I could see on the valves. My guess is the rings. I had an oil sample done locally that showed more iron, lead, and aluminum than samples from previous engines. Some investigation needs to be done.

So the plan is that if the bores and pistons are in good shape we'll just put a different ring package, lifters, and bearings in it along with the other stuff that needs to be replaced. I'm on the original valve springs. There were no marks on the pistons reliefs and dyno testing showed no signs of the valve train being out of control. I really don't want to mess with this combo, just freshen it.

I do have some epoxy in the intake but, I figured 5 or 6 pulls wouldn't hurt. However, we just ran out of time after 14 pulls. I got it off the pump Wednesday so it's rebuild time.

Author:  StrokerCamaro [ Fri Nov 23, 2012 8:31 pm ]
Post subject:  Re: Dyno my motor

What is acceptable on leakdown numbers?

Author:  Adger Smith [ Sat Nov 24, 2012 1:44 am ]
Post subject:  Re: Dyno my motor

That is not bad for an engine with that many runs and time. I feel the time sitting in the garage or trailer through each winter is as hard on an engine as running it all season. No matter how hard you try to stop it is is going to corrode in many places.... You might have picked up a little power with fresh springs & leak might have become better. It is funny how engines respond to fresh springs.

Author:  Beretta [ Sat Nov 24, 2012 7:52 am ]
Post subject:  Re: Dyno my motor

What springs are you running Bruce?

Author:  nomad [ Thu Nov 29, 2012 7:38 am ]
Post subject:  Re: Dyno my motor

Adger, I noticed on a previous engine that after the engine sat for a while, the first oil sample would show elevated levels of iron. After which, that would level off. I'm assuming that would be the result of bore rust. Since then I've never let my car sit in the trailer. Gets put into the garage the next morning.

I'm using the springs that came with the AFR heads. I had to set them up as they were really loose from the factory.

Author:  Beretta [ Thu Nov 29, 2012 7:59 am ]
Post subject:  Re: Dyno my motor

CRC engine stor is your best friend after your done racing for the day...

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