Buckaroo Banzi

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.

Mighty Shilling

Nice... that effectivly drops compression, so could you run slightly higher boost?

Eyal 951

so hot spots aren't an issue with these? Laust likes to run high boost, so I would assume he found it a non issuse?

testarossa_td

Nice work!

Laust..time to post a video of a running engine and a belt that has been cut almost all the way through!...I think you see where this is going

Porsche-O-Phile

Any potential issues with the coating coming off and going through the turbo?

MPD47

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.

Buckaroo Banzi

I checked out Swain carefully and there ceramic coating is considered one of the industries best . Is it possible to flake off? Of course there is given the temperatures in the combustion chamber of a turbo anything is possible.

However Gold Coat is reputedly designed to withstand the extremes of turbo engines. So it is highly unlikely any flacking will occur.

fast951

Hi Rande, Is the coating for the Alusil or Nikasil block? Pistons look good!

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

Porsche-O-Phile

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. . .

BC

Swain's coating is what I put on my stock pistons as well. Hopefully it will help them (cast) stand up to boost.

Buckaroo Banzi

Hi John,

Thanks,
This setup is for the Nicksil....

Buckaroo Banzi

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.

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?

Buckaroo Banzi

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