Author Topic: testing an engine out of the frame (Read 4093 times)

gregwaits · « **on:** December 05, 2007, 08:03:28 PM »

With an engine out of the frame, how can I check it out to see if it runs? I have never bench tested an engine so this is new territory for me.

Obviously I need to set up a fuel source and have the battery hooked up, but what else?

Suggestions?

HondaMan · « **Reply #1 on:** December 05, 2007, 08:13:38 PM »

If it's not the 750, but the one in your avatar....

...add oil, battery to the points/coils, fuel to the carbs, and a fire extinguisher (or friend with a hose) nearby. The exhausts can actually spit fire without pipes. Noisy, but cool!

Oh...make sure it's held down with something. The front of the engine likes to kick upward.

gregwaits · « **Reply #2 on:** December 05, 2007, 08:17:20 PM »

If it is a sohc 750 engine, what then?

Bodi · « **Reply #3 on:** December 05, 2007, 08:31:37 PM »

You need an oil tank connected. Otherwise, same story.

rbmgf7 · « **Reply #4 on:** December 05, 2007, 09:00:18 PM »

here's what i did...

the engine is strapped to a atv lift and the gas/oil tanks are straddling some saw-horses.

754 · « **Reply #5 on:** December 05, 2007, 09:32:46 PM »

Are you actually saying that you would not buy the 69 if it does not start..

?!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

and that you are going to spend hours trying to start it there.. THEN..offer them under a hundred bux !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

gregwaits · « **Reply #6 on:** December 05, 2007, 09:42:57 PM »

Wow, you sure jump to conclusions.

No, I am not saying what you think I said. I am most definitely buying the bike (engine and all). Then after it is home I would like to test the engine out.

(too bad it won't slide into the CB500 frame!)

rhinoracer · « **Reply #7 on:** December 05, 2007, 10:49:26 PM »

If you have the frame I think it's less of a hassle to mount it than to rig a test bench.

gregwaits · « **Reply #8 on:** December 06, 2007, 12:08:07 AM »

Great point thx!

lhemrick · « **Reply #9 on:** December 10, 2007, 10:05:39 AM »

Here is a picture of my "Redneck Dyno"!

dusterdude · « **Reply #10 on:** December 10, 2007, 12:39:43 PM »

dude,you`re my kind of redneck.

CrisPDuk · « **Reply #11 on:** December 10, 2007, 07:41:15 PM »

That redneck dyno looks like the rig we set up to test run the V6 from my Ford Sierra before we put it back in the car

We thought we were being smart strapping it down securely to the bench, but the vibrations made the whole bench walk off up the garage

Which would have been OK, if it hadn't been running a high pressure pump for the fuel injection, you wouldn't believe how far a Bosch pump can throw fuel when you give it some freedom

Sometimes the stupidity I displayed in my youth astounds even me

Based on my experience with that motor though, I can offer you a tip Greg, if you don't fit the exhaust, make sure you point the exhaust out of a doorway, either that or wear ear defenders and earplugs

dusterdude · « **Reply #12 on:** December 11, 2007, 08:16:24 AM »

if you dont fit the exhaust,you`re liable to burn a valve or 3.

Cyclone · « **Reply #13 on:** December 11, 2007, 05:11:06 PM »

My run stand, originally built to maintain air cooled VW motors.
==============================================================

lostinthe202 · « **Reply #14 on:** December 11, 2007, 06:27:27 PM »

Quote from: dusterdude on December 10, 2007, 12:39:43 PM

dude,you`re my kind of redneck.

Hahahahahaha!

+1

DarkRider · « **Reply #15 on:** December 11, 2007, 08:03:43 PM »

Im thinking the reason he wants to bench test it is so he can get an idea of the engines condition before fitting it into the frame only to find out it needs a rebuild and have to take it back out.

Lumbee · « **Reply #16 on:** December 12, 2007, 09:04:55 AM »

...have we forgotten the handy dandy $20 compression tester?

A compression test is gonna give you a pretty good idea on the condition of the internals...maybe better...

lhemrick · « **Reply #17 on:** December 12, 2007, 03:51:58 PM »

The reason I built the redneck dyno is: I have one cylinder of the four that is down some 60 lbs from where it should be and I was told that if it had not been run in a while to fire it up and run it. Seems there were several that think if I do this that cylinder may "heal" itself in time. Does anyone have anything further to add? I'm all hears! Don't want to open it up if I don't have to. nowhatimean!

754 · « **Reply #18 on:** December 12, 2007, 04:19:31 PM »

Would you rather install an engine, get it running & insure it to test in, having only the compression numbers?

Or would you rather see it running and know whether it burns oil or not. then install it?

Need I say more................

News:

Author Topic: testing an engine out of the frame (Read 4093 times)