Dyno and the consequences on an engine or car?

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Oct 11, 2002 | 10:12 AM

#16

blkchevyz

Registered User

Joined: Nov 1998

Posts: 575

From: St Charles MO, USA

i did this on a dyno
http://home.earthlink.net/~blkchevyz/driveshaft.jpg

it happend when they hit the brake for the drums. i think my pinion angle was off.

Oct 11, 2002 | 10:14 AM

#17

cablebandit

Registered User

Joined: Aug 2002

Posts: 36

From: Atlanta, Ga

ahhhh...you may be right. We b eat the guy up for a misunderstanding

Now THATS American

Oct 11, 2002 | 11:05 AM

#18

cASe SenSiTive

Exposed Member

Joined: May 1999

Posts: 647

From: Dangerously close to Detroit

Quote:

Originally posted by blkchevyz
i did this on a dyno
http://home.earthlink.net/~blkchevyz/driveshaft.jpg

it happend when they hit the brake for the drums. i think my pinion angle was off.

Wow! That's weird...
I've been running/observing a chassis-dyno(Mustand Dyno) at a local shop here for ~2 years now, and I've never seen something like that before. No damage that was actually caused by the dyno in all that time.

Oct 11, 2002 | 11:19 AM

#19

blkchevyz

Registered User

Joined: Nov 1998

Posts: 575

From: St Charles MO, USA

i thought it was strange also. man did it scare the hell out of me, i thought the motor blew up. i did get lucky it only dented my torque arm and the guys floor.
i've done well over 20 pull before with no problems.

Oct 11, 2002 | 11:37 AM

#20

Highlander

Thread Starter

Registered User

Joined: Mar 2002

Posts: 3,082

From: San Juan PR

Yes the misconception was mine...regarding to chassis dyno...

It was on a brake dyno then (out of car) With the above posts now I undertand why they did what they did before shipping his engine...

Oct 15, 2002 | 07:34 PM

#21

jimlab

Registered User

Joined: May 2000

Posts: 799

From: Redmond, WA

Quote:

Originally posted by kmook
Ehh... who would have thought the day would come when i would disagree with Mr Jimlab

It happens.

Quote:

The dyno i have used before doesnt use a fan or two, but a large device close to the ground that blows a huge amount of air. I mean you can barely stand in front of the car with it on... So at least in my case i dont think the cooling argument is viable.

Then the facilities you've been frequenting are much better equipped than the ones that I've been to.

Quote:

Originally posted by cablebandit
If you've got heat problems with a 30 second dyno pull, you have bigger problems and don't need to be on a dyno in the first place.

You're right. If your car isn't in a state of tune where it could survive a single pull on the dyno, then it shouldn't be on one in the first place. But are you saying that subsequent pulls won't be affected by heat soak, and that temperatures won't continue to climb unless you let the car sit and cool in between pulls? Or that tuning on a dyno can't result in a combination that when coupled with the sometimes higher than normal operating temperatures could result in detonation?

While I agree that it's probably far less of an issue with naturally aspirated cars, or cars on low boost, high boost turbocharged or supercharged cars which require intercooling can suffer far more on a dyno when there is inadequate airflow, and the elevated temperatures of the compressed intake charge, coupled with insufficient cooling can result in detonation. I should have qualified my statements further, apparently.

Oct 15, 2002 | 08:30 PM

#22

slowpoke96z28

Registered User

Joined: Jul 1998

Posts: 371

From: The Hutch, TX

i have to agree with highlander on the boost issue. take any engine with forced induction and rev it with no load, and you will not see as much, if any boost, be it super or turbocharged.