Platinum Contributing Member Jimmy Snacks Posted March 25, 2019 Platinum Contributing Member Share Posted March 25, 2019 Cold, Hot, Throttle....ect....I’ve done it before but it’s been awhile...be a nice break from Collusion. Quote Link to comment Share on other sites More sharing options...
AKIQPilot Posted March 25, 2019 Share Posted March 25, 2019 You should do a cold test followed by a test at full operating temp throttle held wide open by a tie wrap or someone else holding it. All spark plugs removed. Pull as hard as you can 5-6 times minimum. Perform the test the same way of all cyls of all sleds or engines. 3 1 Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Skidooski Posted March 25, 2019 Platinum Contributing Member Share Posted March 25, 2019 And keep in mind all gauges read differently. I have 2 and they read 15psi off from each other. I have a friend who bases what fuel to use in his race sled off of comp reading from his gauge 1 Quote Link to comment Share on other sites More sharing options...
Zambroski Posted March 25, 2019 Share Posted March 25, 2019 AKIQ nailed it. Slinger prolly disagrees but...meh. Quote Link to comment Share on other sites More sharing options...
racer254 Posted March 25, 2019 Share Posted March 25, 2019 44 minutes ago, AKIQPilot said: You should do a cold test followed by a test at full operating temp throttle held wide open by a tie wrap or someone else holding it. All spark plugs removed. Pull as hard as you can 5-6 times minimum. Perform the test the same way of all cyls of all sleds or engines. Bingo, probably make sure the kill switch is off, but otherwise perfect. Pull until the guage stops moving is what I go by. You doing it on that IQR? Have fun getting to that damn pto side jug. Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Jimmy Snacks Posted March 25, 2019 Author Platinum Contributing Member Share Posted March 25, 2019 17 minutes ago, racer254 said: Bingo, probably make sure the kill switch is off, but otherwise perfect. Pull until the guage stops moving is what I go by. You doing it on that IQR? Have fun getting to that damn pto side jug. Oh great...what’s the secret? Keep in mind I’m a moron. Quote Link to comment Share on other sites More sharing options...
AKIQPilot Posted March 25, 2019 Share Posted March 25, 2019 4 minutes ago, Jimmy Snacks said: Oh great...what’s the secret? Keep in mind I’m a moron. As long as you have the flexible hose it will screw in easily. Just like up the threads and twist the hose Make sure you dont use any kind of extension on the hose before screwing it into the head. 1 Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Jimmy Snacks Posted March 25, 2019 Author Platinum Contributing Member Share Posted March 25, 2019 3 minutes ago, AKIQPilot said: As long as you have the flexible hose it will screw in easily. Just like up the threads and twist the hose Make sure you dont use any kind of extension on the hose before screwing it into the head. Got ya....thanks! Quote Link to comment Share on other sites More sharing options...
racer254 Posted March 25, 2019 Share Posted March 25, 2019 14 minutes ago, AKIQPilot said: As long as you have the flexible hose it will screw in easily. Just like up the threads and twist the hose Make sure you dont use any kind of extension on the hose before screwing it into the head. Mine is still a very, very tight PITA with my compression gauge. Quote Link to comment Share on other sites More sharing options...
AKIQPilot Posted March 25, 2019 Share Posted March 25, 2019 9 minutes ago, racer254 said: Mine is still a very, very tight PITA with my compression gauge. 600r motor? What year chassis? Quote Link to comment Share on other sites More sharing options...
irv Posted March 25, 2019 Share Posted March 25, 2019 1 1 Quote Link to comment Share on other sites More sharing options...
Rod Posted March 25, 2019 Share Posted March 25, 2019 Cold or warm whatever. Hold the throttle open and test both cylinders. Youll know right away if there’s an issue if there’s a big variance between the cylinders Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Jimmy Snacks Posted March 25, 2019 Author Platinum Contributing Member Share Posted March 25, 2019 28 minutes ago, Dump said: Cold or warm whatever. Hold the throttle open and test both cylinders. Youll know right away if there’s an issue if there’s a big variance between the cylinders Like 10% difference or more ain’t good. Quote Link to comment Share on other sites More sharing options...
Rod Posted March 25, 2019 Share Posted March 25, 2019 3 minutes ago, Jimmy Snacks said: Like 10% difference or more ain’t good. Yeah roughly 10 psi variance becomes more concerning. You’ll start to notice it in the way it runs in the 30+ psi variance range 1 Quote Link to comment Share on other sites More sharing options...
racer254 Posted March 25, 2019 Share Posted March 25, 2019 (edited) 1 hour ago, AKIQPilot said: 600r motor? What year chassis? 2015 600r. It works but it is tight. Edited March 25, 2019 by racer254 Quote Link to comment Share on other sites More sharing options...
AKIQPilot Posted March 25, 2019 Share Posted March 25, 2019 (edited) 2 minutes ago, racer254 said: 2015 600r Hmm. Ive never had any trouble getting either of my compression testers threaded into the hole. The spark plugs and boots are a little tight but still no issue at all. Maybe my hose is different. Edited March 25, 2019 by AKIQPilot Quote Link to comment Share on other sites More sharing options...
racer254 Posted March 25, 2019 Share Posted March 25, 2019 Just now, AKIQPilot said: Hmm. Ive never had any trouble getting either of my compression testers threaded into the hole. The spark plugs and boots are a little tight but still no issue at all. Maybe my hose is different. I think my adapter is the issue. LOL Quote Link to comment Share on other sites More sharing options...
AKIQPilot Posted March 25, 2019 Share Posted March 25, 2019 1 minute ago, racer254 said: I think my adapter is the issue. LOL So any adaptor between the head and the schrader valve in the compression tester will give false low compression readings. Most of those little chrome adaptors are at least 2.5cc in volume. When the installed volume of the head is only 20cc and you add a few more cc’s it will show 12-15psi less compression than there really is. 1 Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Highmark Posted March 25, 2019 Platinum Contributing Member Share Posted March 25, 2019 3 hours ago, Zambroski said: AKIQ nailed it. Slinger prolly disagrees but...meh. Coach (aka Toolkit method) What's compression? Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Highmark Posted March 25, 2019 Platinum Contributing Member Share Posted March 25, 2019 (edited) 11 minutes ago, racer254 said: I think my adapter is the issue. LOL Careful not to tighten it down too much and collapse the O-ring too far. If it has a rubber one. Edited March 25, 2019 by Highmark Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Skidooski Posted March 25, 2019 Platinum Contributing Member Share Posted March 25, 2019 7 minutes ago, Highmark said: Coach (aka Toolkit method) What's compression? Quote Link to comment Share on other sites More sharing options...
racer254 Posted March 25, 2019 Share Posted March 25, 2019 Is this one better? 15 minutes ago, AKIQPilot said: So any adaptor between the head and the schrader valve in the compression tester will give false low compression readings. Most of those little chrome adaptors are at least 2.5cc in volume. When the installed volume of the head is only 20cc and you add a few more cc’s it will show 12-15psi less compression than there really is. Nailed it. Mine always reads 10 low. Maybe I should use this one. Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Highmark Posted March 25, 2019 Platinum Contributing Member Share Posted March 25, 2019 (edited) 5 minutes ago, Skidooski said: Dude I know what compression is. I was making shit out of toolkit. BTW you wouldn't have any OEM pistons around for a 2000 Mach Z? Edited March 25, 2019 by Highmark Quote Link to comment Share on other sites More sharing options...
Snoslinger Posted March 25, 2019 Share Posted March 25, 2019 just did my '07 a few weeks ago. cold, throttle closed, other plug out. didn't get above 90 which is low, but after 11,000 miles, it's no surprise. not sure if throttle open would have made much difference. Quote Link to comment Share on other sites More sharing options...
AKIQPilot Posted March 25, 2019 Share Posted March 25, 2019 14 minutes ago, Snoslinger said: just did my '07 a few weeks ago. cold, throttle closed, other plug out. didn't get above 90 which is low, but after 11,000 miles, it's no surprise. not sure if throttle open would have made much difference. Well add “compression test” to the long list of shit you know nothing about. 2 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.