Compression & Dome Size on Ported Cylinder

[keefer]

I thought ring end gap was supposed to be about .014 to .016 for stock, not sure what Wiseco recommends on the new style pistons.

 

[Matt_E]

I already have 84.25 pistons and some 86s. :evil:

 

[Matt_E]

Here's some pictures.

 

[Matt_E]

Bore is 3.322", pistons are 3.300"
That's a whopping 11 thou clearance.
I need to find a different machine shop.

More pics of the clearance on the rings

 

[Kennay]

wow that gap does look big, and I'm a nooblet

 

[waxhead]

And there is why you have a low compression

 

[keefer]

Could someone tell me where to measure bore size?

I just checked at the deck level, and it comes to 84.38mm. A bit big for 84mm.
Also, where to measure the piston? I measured it at the crown, but I am 99% sure that's wrong.

Ring gap is 0.09 inches.
I did not detect anything out of round in the cylinder (deck height anyways)

Looks like .090 to me?? I agree with wax, time to bore it up to 84.5 or re sleeve again. That sux man.

 

[SUPERTUNE]

Sometimes, shipping pays!!!
Radney, Chuck, Patrick and Mike
TEAM SCREAM (New home of X-SCREAM)
1988 Carroll St.
Clearwater, Fl. 33765
(727)442-7700
xscream@tampabay.rr.com

 

[keefer]

The man speaks wisdom. Hear it and heed and you will have a kick azz setup.

 

[Matt_E]

Sometimes, shipping pays!!!
Radney, Chuck, Patrick and Mike
TEAM SCREAM (New home of X-SCREAM)
1988 Carroll St.
Clearwater, Fl. 33765
(727)442-7700
xscream@tampabay.rr.com

Thanks Chuck. However: Be aware that I bought it this way. Bored, honed & with piston kit.
I did not have it bored. Too bad it's too big. :soapbox:

I got 84.25 Pro-X's kicking around, I'll go with that if I can.

 

[Crab]

I also have a cyl in need of bore, looks like I need to get back in toutch with Radney.

 

[Matt_E]

Looks like .090 to me?? I agree with wax, time to bore it up to 84.5 or re sleeve again. That sux man.

Why resleeve?

 

[crammit442]

Thanks Chuck. However: Be aware that I bought it this way. Bored, honed & with piston kit.
I did not have it bored. Too bad it's too big. :soapbox:

I got 84.25 Pro-X's kicking around, I'll go with that if I can.

Since you're where you are, save some shipping time and money and send it to Randy!:Banane19:

WATCON.COM
6487 Seabeck Hwy NW
Bremerton WA 98312
Phone: (360) 692-3492 Fax: (360) 692-2285

 

[Matt_E]

I'll give the man a call. Thanks Charles.

 

[crammit442]

I'll give the man a call. Thanks Charles.

As long as you talk to him beforehand, he can probably turn it around in a day or two. One day shipping. Send it next monday ride it on friday.

 

[Matt_E]

Heck yea. I Haven't talked to Randy in a while anyways.
He can chamfer the ports for me, too.

 

[Crab]

Watcon? His bore machine is broke last I talked to him.

 

[Matt_E]

I'll find out tomorrow.

 

[Matt_E]

Mmmmh....I just measured the Pro-X pistons.
They would give me 5 thou clearance (perfect) but ring gap is at 40 thou. (0.04)

 

[#ZERO]

I'll bet you check your ring gap and piston clearance from now on. :hitwithrock:

You have to watch those local yocal machine shops with their boring equipment.

It pays to have the job done right with someone familiar with jet-ski cylinders.

Having the proper ring end gap is just as important as the piston clearance.