Nytro O-Ring Head Spacer

[Tarzannr1]

Anyone here who has experience with Powderlites Nytro O-Ring Head Spacer http://powderlites.com/partsyamaha.php?
I am planing to drive 24psi,can this o-ring head spacer handle this pressure?
My engine is built with Carrillo rods and low pistions and kiblewhite springs.

 

[Tarzannr1]

I am so troubled with head lift at 20psi and bring pressure in the cooling system with mcx headspacer
I'm so tired of and changing the Cylinder head gasket over and over.
The compression ratio now is 8:5

 

[Cpt.Ron]

24PSI???

Tarzan is 24 PSI really required?? What application are you using it for, drag racing or mountain riding?? I am just curious, ..I can understand 24 for racing but for practical daily reliable riding, ..wow! Is this on your Big Engine??

To answer your question, I don't have first hand experience with the Powderlites O-ring head shim. Going back a few years, there were some guys trying to run 22 + psi on their Yammies, they had a Shop machine cut an o-ring groove into the block, then place O-rings into the grooves. Seems to me they had some success but also some related issues, perhaps they can add their input for you.

Makes for a lot of dynamic compression when spinning high rpm's with 20+ lbs of boost. Reducing your static ratio down to 8.5 should definitely help.

Noticeable around here these days, guys are reducing overall full load boost and opting for a higher static compression ratio for overall performance gains with a crisper throttle response.

 

[Tarzannr1]

Tarzan is 24 PSI really required?? What application are you using it for, drag racing or mountain riding?? I am just curious, ..I can understand 24 for racing but for practical daily reliable riding, ..wow! Is this on your Big Engine??

To answer your question, I don't have first hand experience with the Powderlites O-ring head shim. Going back a few years, there were some guys trying to run 22 + psi on their Yammies, they had a Shop machine cut an o-ring groove into the block, then place O-rings into the grooves. Seems to me they had some success but also some related issues, perhaps they can add their input for you.

Makes for a lot of dynamic compression when spinning high rpm's with 20+ lbs of boost. Reducing your static ratio down to 8.5 should definitely help.

Noticeable around here these days, guys are reducing overall full load boost and opting for a higher static compression ratio for overall performance gains with a crisper throttle response.

Yes it is for dragracing with my buildt engine In the mountains i run 16-18psi. But maybe 24psi is to much for my engine?

 

[roughrider99]

Maybe close deck your block and o ring it? That would be strong enough that you could raise your comp ratio again. After 20 psi the cylinders start to deflect and can oval out over time if consistently run that high

 

[BigFish BC]

Tarzan is 24 PSI really required?? What application are you using it for, drag racing or mountain riding?? I am just curious, ..I can understand 24 for racing but for practical daily reliable riding, ..wow! Is this on your Big Engine??

To answer your question, I don't have first hand experience with the Powderlites O-ring head shim. Going back a few years, there were some guys trying to run 22 + psi on their Yammies, they had a Shop machine cut an o-ring groove into the block, then place O-rings into the grooves. Seems to me they had some success but also some related issues, perhaps they can add their input for you.

Makes for a lot of dynamic compression when spinning high rpm's with 20+ lbs of boost. Reducing your static ratio down to 8.5 should definitely help.

Noticeable around here these days, guys are reducing overall full load boost and opting for a higher static compression ratio for overall performance gains with a crisper throttle response.

yah there was a few of us that did it & most failed within a 1000km but it was all because of the size of copper wire used for the ring was to big.mine has been perfect since we re-sized the wire but i never go over 18lbs & now run 15-16lbs most of the time,just to fast above that

 

[roughrider99]

yah there was a few of us that did it & most failed within a 1000km but it was all because of the size of copper wire used for the ring was to big.mine has been perfect since we re-sized the wire but i never go over 18lbs & now run 15-16lbs most of the time,just to fast above that

Has anyone tested high boost (over 25psi) with the resized copper wire?

 

[BigFish BC]

Has anyone tested high boost (over 25psi) with the resized copper wire?

i dont think so but its possible i know me neil & render all had it done plus some of the guys at alpine motor sports in salmon arm .none of the guys i know ran that much boost.

 

[roughrider99]

In your opinion is it still better than a gasket, got an apex motor that I wanna be able to crank up 30lbs for drags and the odd day on the mountain

 

[Cpt.Ron]

What cylinders?

"Yes it is for drag racing with my buildt engine In the mountains i run 16-18psi. But maybe 24psi is to much for my engine?"

Tarzan

What cylinders does your big bore stroker engine have, bored out stock with nikasil plating? or did they install the Ductile Iron cylinders? I would suspect that the Ductile iron cylinders would be more capable of retaining their shape under big boost.

You could also check with Hurricane Performance, or GNS Enterprises to see what they recommend. They run 25 to 30 lbs boost on the race engines.

CR

 

[BigFish BC]

In your opinion is it still better than a gasket, got an apex motor that I wanna be able to crank up 30lbs for drags and the odd day on the mountain

on a apex motor my guess is you would oval the cylinders pretty fast with that much boost,have seen them do it at allot less boost.like ron said only guys i know that run that kinda boost is hurricane performance,think they run steel sleeved cylinder.

 

[roughrider99]

Of course that's why it's getting closed deck and sleeved

 

[BigFish BC]

Of course that's why it's getting closed deck and sleeved

well that would help yah i would check with hurricane or osp both run big boost,i know the run custom head studs.

 

[Motleyone]

I run an fully built Hurricane Performance motor in my Nytro. My motor is ringed, I run carillos and the CP turbo pistons that Paul gave me. It also has some very aggressive head work done and upgraded valve springs. Originally in my 08 motor I had it steel sleeved but found it ran way to hot. I ordered an 2011 block and had Dave reassemble it. Never had a heat issue since that. I have run the sled up to 28 lbs. Last year I ran it at 22-24 lbs all day long on 112 fuel and never had an issue. If I remember correctly Dave said the head is tourqued to 80 lbs.

 

[Tarzannr1]

"Yes it is for drag racing with my buildt engine In the mountains i run 16-18psi. But maybe 24psi is to much for my engine?"

Tarzan

What cylinders does your big bore stroker engine have, bored out stock with nikasil plating? or did they install the Ductile Iron cylinders? I would suspect that the Ductile iron cylinders would be more capable of retaining their shape under big boost.

You could also check with Hurricane Performance, or GNS Enterprises to see what they recommend. They run 25 to 30 lbs boost on the race engines.

CR

?I havent a big bore engine,my friend have a stroker engine He have the stroker kit from Hurricane instaled My engine have Carrillo rods,low pistons,kibbelwhite stronger valve springs,head jobb and a Mcx chim.

 

[Cpt.Ron]

?I havent a big bore engine,my friend have a stroker engine He have the stroker kit from Hurricane instaled My engine have Carrillo rods,low pistons,kibbelwhite stronger valve springs,head jobb and a Mcx chim.

My mistake, Tarzan, I thought you had the big bore as well.