The cure for happiness

[Shaun @ Tru6]

Honestly Daniel, I would love to play with this motor building it into a GTS and going for an honest 350 hp, or go insane with a Kuhn twin turbo set-up. But even with as much fun as I'm having, I really shouldn't be here, instead I should be focusing on my own Singerization of an 80 coupe that was originally to be lightweight ugly fast car but turned into a design testbed. Just the machine work on this motor ate up my Kroon wiring harness budget for the car. So either I sell this car when it's done and I've have a little fun with it or I build out my bright dip+anodize service in the next few months and get to keep it. Building a new powder coating booth too. So I think it's going to be a completely stock rebuild, which isn't a bad thing.

Good advice on the crank, I had read about and forgotten the benefits of doing that all in the last 2 weeks. Now that I'm into the rebuild phase, I have to put an official punch list together.

Originally Posted by DanielDudley

Yikes ! Seems to me that One of those guys over on Rennlist used to have the Holbert speed record car, and that it had the stock cam profile, but altered cam timing. Mark Kibort, I think.

My 85 was owned by a friend of Al Holbert, and was one of the first 32 valve cars in the country. They altered the cam timing on mine as well, but I can't tell you what it is. Kibort will know, if he is still around. From what I understand, you can pick up 25 ponies on an 85/early86 just by replacing the exhaust with a free flow unit. Carl at 928 motorsports used to make one. You might have to get one custom bent today.

Seems like the later heads are also the ones to have, bigger valves. GT spec would be pretty nice, if you can pull that off.

I haven't thought about any of this for years. S4 heads, GT cams and a chip would really get you somewhere. You might want to look into cross drilling the crankshaft. Otherwise, stick to the current redline. A chip may raise the redline, but without altering the crank, you don't want to go there.

Nice project.

[Shaun @ Tru6]

Heads are packed and will be on their way to Bob at Anchor Atlantic tomorrow. Hope to get the new piston in tomorrow so I can bring the block, crank, pistons and rods up to Kinglsey machine shop in Nashua this week.

[Shaun @ Tru6]

Craig Garrett (Pelican cgarr) is working on the lifters, they look great. I also have to research the cams I got, and the cams that were in the motor in the first place. I'm pretty sure the motor had GT cams. Checking end cap and casting #s tomorrow.

[DonDavis]

le bump.

[Shaun @ Tru6]

Hey Don! Heads have been at the machine shop for 7 weeks now. I'm waiting for those before I do anything else. I could put the entire bottom end back together but I'm funny about having the heads back first.

New used cams measured out well. And have a race suspension to pull off this someday. Good tires, but certainly not great tires.

[herr_oberst]

Snow tires!

[pavulon]

Huh? Thought my drill the last known with a cord attached to it!

[Shaun @ Tru6]

that drill is unstoppable, I love it.

[Mrmerlin]

nice build goin on here.
NOTE if you had the crank polished then the sludge traps are filled with polishing compound.
If nothing is done about this then you will smoke your new bearing in about 5 mins of running.

that said I would suggest to remove the trap plugs , they get drilled out,
and clean out the oil bores,
tap the ports and install new screw in plugs, clean the crank atleast 3 times,
and use 3 cans of brake cleaner and simple green then a hot water rinse.
Pistons get soaked in simple green for 12 hours to remove the carbon dont use anything more abrasive than a tooth brush to clean the pistons.

NOTE the pistons have a chromium finish that will look dull green.

[Kraftwerk]

Don't know a lot about engine building... but that is a nice crate for the block!

[rwest]

Shaun,

Tad bit off topic, but related to you; in your anodizing business, what colors are you offering and how tough is it to get a custom color(s). I have a couple hare brained ideas, the most viable one would involve about 500 pieces about 4" square and 1/2" thick.

Rutager

[Shaun @ Tru6]

Originally Posted by rwest

Shaun,

Tad bit off topic, but related to you; in your anodizing business, what colors are you offering and how tough is it to get a custom color(s). I have a couple hare brained ideas, the most viable one would involve about 500 pieces about 4" square and 1/2" thick.

Rutager

Hi Rutager,

I'm doing bright dip+clear and black anodizing but custom colors are available. Send me an email at shaun@tru-6.com with some specifics and I'll talk with my two anodizers.

[Shaun @ Tru6]

Originally Posted by Mrmerlin

nice build goin on here.
NOTE if you had the crank polished then the sludge traps are filled with polishing compound.
If nothing is done about this then you will smoke your new bearing in about 5 mins of running.

that said I would suggest to remove the trap plugs , they get drilled out,
and clean out the oil bores,
tap the ports and install new screw in plugs, clean the crank atleast 3 times,
and use 3 cans of brake cleaner and simple green then a hot water rinse.
Pistons get soaked in simple green for 12 hours to remove the carbon dont use anything more abrasive than a tooth brush to clean the pistons.

NOTE the pistons have a chromium finish that will look dull green.

Thanks for the good info. The crank is perfect so I haven't done anything to it yet. I was considering having it cross drilled. Was going to talk with Greg Brown about exactly what I should do and plan on getting a pan spacer and windage tray.

[Shaun @ Tru6]

4 months later and I've just heard from the 2 machine shops in the last week. I did talk with Bob at Anchor Atlantic 2 months ago though, he let me know the owner of the shop and person that was welding up the one bad head passed away suddenly. He called me the other day to let me know work has started again on the heads, one is already done.


Shop doing the block let me know that #5 has water scoring so I have to go with oversized pistons.

Here's where it may get interesting and I have to do some research but if anyone here knows, please post. I know you can build a high hp motor with a stroker crank, rods and bore the cylinders out to use 968 pistons, 104 vs. 100 mm. To build that motor it's about $20K and go to $30 easily, but my understanding is you get somewhere around 500 hp at 6+ liters.

That is completely out of the budget but I thought now would be a good time to bore the block out to 968 bore, same with the combustion chambers on the heads but retain the crank and rods.

Even if I got little to hp gain doing that, if the engine still ran well (with some sharktuning I'm sure) in that configuration, it makes sense to do it now.

Any thoughts on this?

[Shaun @ Tru6]

here's what water scoring looks like. 7 years of water in the cylinder where the rings were resting on the alusil.

I'm talking with Greg Brown about doing a 6.5L motor with 550hp using this block, will probably use the engine from the crashed car to get this one going since rods alone are 2 months out.

[Shaun @ Tru6]

Had some fun with a sawzall and the crashed car today. Hope to do the timing belt on this motor next weekend and get it in the car the following one.

[onewhippedpuppy]

That looks like fun!

[Shaun @ Tru6]

Machine shop finally bored out the one bad cylinder to 1st oversize #0 at 100.50mm, all the others are just group 1.

Anyone have an oversize #0 piston sitting on their desk or know where I can get one? I’m guessing Sunset.

I might start building the motor by the end of September. Going to NC this weekend to pick up an RS 2.7 which I want to do first.

Heads are still in NJ somewhere.

[Shaun @ Tru6]

It turns out that there are no .59 pistons (tolerance group #0 oversize) available from Porsche in the world. No warehouses, no dealerships, they are gone.

Sunset found 45 .69 pistons (tolerance group #1) in Germany. $288.62 and $43 airfreight. Not too bad. Manual says for first oversize group 1, piston is 100.490 + – .007 and bore is 100.510 + – .005

I should be able to start rebuilding it as early as end of September. Have to order rings, bearings and gasket kits once the block is done and pistons/rods are all balanced.


The cure for sadness:

1987 Porsche 928 S4 | Bring a Trailer

[jwasbury]

^dang that car is bringing some $ on the BAT auctions.

I bought and sold my '88 5-speed S4 with half the mileage for less $$. Perhaps people are beginning to appreciate the 928.