Non-Interference Pistons-Pics
#1
Racer
Thread Starter
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Just received my pistons back from coating and I thought I would share the results.
The valve reliefs where done by Laust Pederson (rennlister) for $130
He has done the same to his car and claims no discernable difference between stock performance (heat mileage power etc.) and valve relief’s.
I sent Laust my valve measurments to verify clearances.
Laust has checked the non interferance manualy but has yet to break a belt on a running motor to confirm it works. I personaly think it will, even if it saves just two of my valves it would have payed for itself.
Laust was great to work with heck he even delivered the pistons to me.
I think his knowledge workmenship is first rate.
The coating by Swain $232.17 includes shipping of $22.17
selected the Gold Coat and PC-9 on the skirts.
I was suprised at how thick the coating is on the top and side skirts
I am very pleased with Swains quality and workmenship I intended on using
them again.
I would reccomend this to anyone doing a rebuild to me it's cheap insurance intake valves are $80 each exhasut valves are $100+ each.
The valve reliefs where done by Laust Pederson (rennlister) for $130
He has done the same to his car and claims no discernable difference between stock performance (heat mileage power etc.) and valve relief’s.
I sent Laust my valve measurments to verify clearances.
Laust has checked the non interferance manualy but has yet to break a belt on a running motor to confirm it works. I personaly think it will, even if it saves just two of my valves it would have payed for itself.
Laust was great to work with heck he even delivered the pistons to me.
I think his knowledge workmenship is first rate.
The coating by Swain $232.17 includes shipping of $22.17
selected the Gold Coat and PC-9 on the skirts.
I was suprised at how thick the coating is on the top and side skirts
I am very pleased with Swains quality and workmenship I intended on using
them again.
I would reccomend this to anyone doing a rebuild to me it's cheap insurance intake valves are $80 each exhasut valves are $100+ each.
#6
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Jeff, SwainTech is right down the road from me, I've spoken with the guys before and they say when the material does deteriorate it does so in a non destructive manner. They havent had any issues with turbo cars or cylinder scoring.
#7
Racer
Thread Starter
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Originally Posted by Porsche-O-Phile
Any potential issues with the coating coming off and going through the turbo?
However Gold Coat is reputedly designed to withstand the extremes of turbo engines. So it is highly unlikely any flacking will occur.
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#9
Rennlist Junkie Forever
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Buckaroo Banzi
The only real benefit to doing this is that you can run larger valves and more agressive valve timing/lift.
Fortunately, this more than offsets the problems introduced by cutting up the quench area. (because Porsches certainly smart enough to machine in valve reliefs but chose not to for the same reason).
The fact that the valves won't hit the pistons are trivial (if you maintain your belts).
Did you set this up to clear the valves with larger valves and a big cam.. or with stock valves and a stock cam (hopefully the former)?
TonyG
The only real benefit to doing this is that you can run larger valves and more agressive valve timing/lift.
Fortunately, this more than offsets the problems introduced by cutting up the quench area. (because Porsches certainly smart enough to machine in valve reliefs but chose not to for the same reason).
The fact that the valves won't hit the pistons are trivial (if you maintain your belts).
Did you set this up to clear the valves with larger valves and a big cam.. or with stock valves and a stock cam (hopefully the former)?
TonyG
#10
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Cool, thanks for the info. on that. I'm actually thinking of getting some things done (callaway exh. manifold, etc.) but it'll all be in exterior applications so if there is any flaking it won't result in a catastrophic failure. Their stuff looks top-rate to be sure. . .
#11
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Swain's coating is what I put on my stock pistons as well. Hopefully it will help them (cast) stand up to boost.
#13
Racer
Thread Starter
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Originally Posted by TonyG
Buckaroo Banzi
The only real benefit to doing this is that you can run larger valves and more agressive valve timing/lift.
Fortunately, this more than offsets the problems introduced by cutting up the quench area. (because Porsches certainly smart enough to machine in valve reliefs but chose not to for the same reason).
The fact that the valves won't hit the pistons are trivial (if you maintain your belts).
Did you set this up to clear the valves with larger valves and a big cam.. or with stock valves and a stock cam (hopefully the former)?
TonyG
The only real benefit to doing this is that you can run larger valves and more agressive valve timing/lift.
Fortunately, this more than offsets the problems introduced by cutting up the quench area. (because Porsches certainly smart enough to machine in valve reliefs but chose not to for the same reason).
The fact that the valves won't hit the pistons are trivial (if you maintain your belts).
Did you set this up to clear the valves with larger valves and a big cam.. or with stock valves and a stock cam (hopefully the former)?
TonyG
Hi TonyG,
Set it up with a stock valves and cam. would love to have a sledgehammer from John but I have already sunk 15k into a car that is still in pieces and needs at least 5k more to be up and running. As you know the 951 gives you alot of bang for the buck. Right now I am trying to get some "Bang" before I shell out anymore bucks.
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#15
Racer
Thread Starter
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Originally Posted by Racer46
When you had the relief’s cut did you take into account the coating thickness or are you back to having an interference engine again?
Yes we did,
Laust thought of everything I contacted Swain and they told us the thickness would be no more than .025 Laust plugged that into his caculations.
I tell you the man knows his stuff
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