playnotwork
Member
yes in the uk will try to call you, hopefully over the weekend
gx200 lacks revs
- Thread starter playnotwork
- Start date
yes in the uk will try to call you, hopefully over the weekend
playnotwork
Member
Built up and works ok.
How can I compare the output from this to my other engines, without going to the track and without dyno. Just need a comparison test!
playnotwork
Member
Go easy on me if i am wrong.
If the lash caps are set correctly. Turning over the engine using the pull start slowly past the de-compression on the cam. With no spark plug in the engine turns over very easily. With spark plug replaced the pull start is difficult and virtually stops. Varies diffently for differnt engines.
Question:- is this an indication of the engine compression? And the more solid the pull cord the better the engine?
If the lash caps are set correctly. Turning over the engine using the pull start slowly past the de-compression on the cam. With no spark plug in the engine turns over very easily. With spark plug replaced the pull start is difficult and virtually stops. Varies diffently for differnt engines.
Question:- is this an indication of the engine compression? And the more solid the pull cord the better the engine?
playnotwork
Member
Why,
what else stops the pull cord but engine compression.
what else stops the pull cord but engine compression.
alvin l nunley
Site Supporter
If the engine revs to 6200 on the stand, that tells me nothing in the engine is terribly wrong. The fact that it won't read that high on the track leads me to believe there are several things that could be less than right.
When things were not going right, the 1st thing I did was check the compression pressure. You need a good gauge, Pep Boys doesn't sell one. I used a Snap On. Expensive, but the best. I have no idea what a good compression reading on your engine would be, it's kind of a comparative thing, check yours, check your friends, compare the differences.
Timing, check yours, ask around, what's good?
Spark plug, it's important, heat range, ask around, what's the competition using.
Jetting, again, ask around. From your responses, I get the idea that your running really lean. Something to check. Too lean can cause detonation, detonation ""kills"" HP. Detonation is caused by excessive heat and/or pressure. In the shop, on the stand, there is very little heat and/or pressure being generated, result, no detonation, but put it on the track, with a load, and you can get detonation.
EGT (exhaust gas temperature) gauge is the perfect way to detect detonation. In my experience, there's no better way to do it.
Calculating CCs. You can do it, you need to know how many ccs in the combustion chamber, but it's best to measure it.
When things were not going right, the 1st thing I did was check the compression pressure. You need a good gauge, Pep Boys doesn't sell one. I used a Snap On. Expensive, but the best. I have no idea what a good compression reading on your engine would be, it's kind of a comparative thing, check yours, check your friends, compare the differences.
Timing, check yours, ask around, what's good?
Spark plug, it's important, heat range, ask around, what's the competition using.
Jetting, again, ask around. From your responses, I get the idea that your running really lean. Something to check. Too lean can cause detonation, detonation ""kills"" HP. Detonation is caused by excessive heat and/or pressure. In the shop, on the stand, there is very little heat and/or pressure being generated, result, no detonation, but put it on the track, with a load, and you can get detonation.
EGT (exhaust gas temperature) gauge is the perfect way to detect detonation. In my experience, there's no better way to do it.
Calculating CCs. You can do it, you need to know how many ccs in the combustion chamber, but it's best to measure it.
playnotwork
Member
Still don't get it!. Doing the above pull cord test on know good or new engines pull cord is hard to pull(Rock solid) until exhaust lobe opens exhaust port then goes easy. On older worn engines, the pull cord does not go as solid.
There you have it . Use the new engine
Its just not the proper way to test an engine in my mind .
I have Bonneville cams in an engine so it kick starts easy .
Compared to another it has low compression, still runs like a scalded dog .
alvin l nunley
Site Supporter
"Regular pump gas"?? What octane? If it will rev up on the stand with no load, but not on the track, I always figured there just wasn't enough horsepower.