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Indy 400 - unreal low compression

Polaris General Discussion

 
 
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  #26  
Old 01-07-2011
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^^Mud's right.
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  #27  
Old 01-07-2011
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Quote:
Originally Posted by mikey007 View Post
The carbs were taken off and cleaned. The slides move fine. I am not trying to be rude, I am just learning, why would slides being stuck cause a loss of compression?
It would restrict the cylinder from drawing in all the air it needs to compress.



Do you have a set of feeler gauges how thick of one fits between the piston and cylinder
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Last edited by blue avenger : 01-07-2011 at 01:57 PM. Reason: proper wording to covay meaning
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  #28  
Old 01-07-2011
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Negative, it will restrict a little but not nearly enough to be 100 psi lower.
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  #29  
Old 01-07-2011
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Ring size? Put the ring in the bore and check end gap
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  #30  
Old 01-07-2011
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Quote:
Originally Posted by wallygator View Post
Ring size? Put the ring in the bore and check end gap
I will do that tomorrow. As long as I have one running sled I guess.
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  #31  
Old 01-08-2011
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when I got my top end rebuilt on my 440 the psi on the first 3 pulls it had was around 115psi then let it run and seat everything properly after a day of that the motor was in tip top shape and was hitting 150 psi. idk if this is normal but this is what happend. your issues just seems wrong with pistons or rings imo
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  #32  
Old 01-09-2011
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Okay, I have some pictures for you guys. Let me know what it looks like to you. I can squeeze the ring tight to the cylinder and the rings only go on one way.

http://www.flickr.com/photos/46156995@N03/
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  #33  
Old 01-09-2011
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Are you going to quite fucking around and get some real measurements!
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  #34  
Old 01-09-2011
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Quote:
Originally Posted by blue avenger View Post
Are you going to quite fucking around and get some real measurements!
I don't have a feeler gauge to get proper measurements at the moment.
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  #35  
Old 01-09-2011
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OK, You need to find out how well the pistons fit the bores now to continue.
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  #36  
Old 01-09-2011
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oh, there was a head gasket right?
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  #37  
Old 01-09-2011
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Yep, there was a headgasket.
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  #38  
Old 01-09-2011
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Your piston ring doesn't come close to meeting on the ends. Take the cylinders and pistons to a repair shop and ask them wtf is wrong. They will be able to measure everything and tell you exactly what is wrong, because something is. They shouldn't charge much to measure them and it should only take a few minutes.
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  #39  
Old 01-09-2011
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Hone looks good, bore looks good, rings look good, mud - this pic shows ring in the piston and coming together: http://www.flickr.com/photos/46156995@N03/5341008018/

What do the heads look like? Did someone miscut the heads when they cut them for the .010 over?
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  #40  
Old 01-10-2011
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I guess I didn't look at the pictures very well then lol. I didn't see that one.
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  #41  
Old 01-10-2011
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I fit the rings down the cylinder walls today and the ring gap does not change at all from what it is in the pictures.

Is it possible that if the timing was off, it wouldn't fire? Or it definitely should have more compression regardless?

I am going to take the rings and cylinders back to Harley where it was rebuilt and see what they say.
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  #42  
Old 01-10-2011
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It should have more compression
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  #43  
Old 01-10-2011
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Definitely more compression if bore, piston, rings all correct.
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  #44  
Old 01-11-2011
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I think I've already said it twice, take it to a machine shop and have them measure the cylinder and piston. Something is wrong, and they will tell you in 5 minutes what we've been trying to figure out for 4 days.
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  #45  
Old 01-12-2011
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He did say hes taking it back to the shop that rebuilt it.

Just dont let them make you pay more for there F%$# up because only the shop could make it work like that
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  #46  
Old 11-20-2011
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I know this post is long over-due but I FINALLY figured out the problem. All along it was a bad hone! Started it up for the first time tonight and it seems to run good so far aside from it wanting to search for an idle. It sometimes rises from 2000 rpm to 3000rpm but that was as high as it got. Any idea's on that?
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  #47  
Old 11-21-2011
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Check for any air leaks.
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