Project: Can she make it to H20i ?

[Don Supreme]

Work has begun


The damage -> Low Comp -> Oil burn -> Rebuild, bigger and better


What do you guys think caused the scoring in that picture?


(Here whats going into the head, still considering a set of cams)

Titanium Retainers, 1mm Oversize Inconel Exhaust Valves, Cat Gold Valve Springs (Dual Exhaust spring)


....More pictures later this week when I get the pistons and stuff.

[Nebone]

You won't disappoint.

[317ssayzarc]

Bout time shes on her way to getting back to action! What overbore are you going with Sean? And what CR and brand?

[Don Supreme]

I am still leaning towards the Mahle 9.0:1 (81.5mm). I guess I really want to ask the machine shop if they think 81.5 is enough to get past those scoring marks.

What do you think?

[Poopie]

go 83mm. its gonna cost the same.

[bassed]

go 83mm. its gonna cost the same.

2nd that. Sean is the scoring even across all cylinders?

[Don Supreme]

2nd that. Sean is the scoring even across all cylinders?

Basically yes, why?

[Don Supreme]

go 83mm. its gonna cost the same.

Might cost more, if I am wrong about these then point in right direction quick (Because I need to make this purchase by tomorrow)!

1) The reason I am sticking wtih 81.5 is because I want the Mahle 9.0:1 pistons (max out @ 81.5mm) and here is why:
A. Most off the shelf wiseco or je (which i don't want) are only 9.25:1 and I want 9:0
B. To make matters worse they (Wiseco) only go up to 82.0 off the shelf
C. I don't have time to wait for a custom piston

D. I am AFRAID of building a setup with piston slap and oil burn from the extra clearance required for the aftermarket forged pistons.

2) Some machine shops have stated they would not bore to 83mm without doing some kind of test (forget name) on the block to verify block strength which COSTS MORE MONEY.


I welcome any tips or suggestions on the topic.

[317ssayzarc]

Alot of people go 83 Sean, tell that machine shop they can either do it or lose your business... Shit, Mikes at 83.5 and hes been on that motor for a bunch of miles now, and his car sees some pretty high cylinder pressures...

As far as setting up aftermarket piston clearance, I set me Wisecos at .003, which is just as tight as stock, and no problems here ... No smoking from the exhaust, no rattle when cold, nothing... Send a pm to Issam to see if JE has any 83's on the shelf (they do from time to time), or if you go Wiseco you can call up Arnold and see if he has any 83's (he happened to when I needed mine)...

[Don Supreme]

Alot of people go 83 Sean, tell that machine shop they can either do it or lose your business... Shit, Mikes at 83.5 and hes been on that motor for a bunch of miles now, and his car sees some pretty high cylinder pressures...

As far as setting up aftermarket piston clearance, I set me Wisecos at .003, which is just as tight as stock, and no problems here ... No smoking from the exhaust, no rattle when cold, nothing... Send a pm to Issam to see if JE has any 83's on the shelf (they do from time to time), or if you go Wiseco you can call up Arnold and see if he has any 83's (he happened to when I needed mine)...

By the way Bob recommends .0015 for the Mahle pistons which is tighter than .003.....

[317ssayzarc]

By the way Bob recommends .0015 for the Mahle pistons which is tighter than .003.....

Wow! stock is .002 so thats super tight...

[prodrive]

Wow! stock is .002 so thats super tight...

Is this the clearance number between the cylinder wall and pistons?
BTW ,she will be a beast for sure ..

[317ssayzarc]

Is this the clearance number between the cylinder wall and pistons?
BTW ,she will be a beast for sure ..

yes sir

[onemoremile]

That is very tight.

I don't see why an aftermarket forged piston would have a different clearance than the stock forged piston. Maybe a thou looser if it is for a race only engine since those are usually looser anyway.

[94jedi]

Sean!!! can't wait to see this thing in action!! Bring her down to H2O my friend!!! I"ll try to make it out that weekend!!!

[pac1085]

That is very tight.

I don't see why an aftermarket forged piston would have a different clearance than the stock forged piston. Maybe a thou looser if it is for a race only engine since those are usually looser anyway.

I think it's because of the differences in the two alloys, high perf forged aftermarket pistons are 2618 (the ones known for piston slap on start up, because they expand more when they get hot) and I think most OEM forged pistons are 4032 (knock sensor friendly, don't expand as much)

[Don Supreme]

I think it's because of the differences in the two alloys, high perf forged aftermarket pistons are 2618 (the ones known for piston slap on start up, because they expand more when they get hot) and I think most OEM forged pistons are 4032 (knock sensor friendly, don't expand as much)

Indeed


Update: Dropped block and head off @ machine shop this morning. I am waiting on the rest of parts (Pistons, bearings, etc) and hopefully I will have this phase wrapped up soon.

[AudiA4_20T]

small port head = gay

[Don Supreme]

small port head = gay

Just as they are starting to prove that the stock aeb head can make big power, I am going to show that a lightly worked small port can also get the job done.

[AudiA4_20T]

Just as they are starting to prove that the stock aeb head can make big power, I am going to show that a lightly worked small port can also get the job done.

or not prove it mwahahah, anyway Sean 8500 is going to be so fun

[317ssayzarc]

I think it's because of the differences in the two alloys, high perf forged aftermarket pistons are 2618 (the ones known for piston slap on start up, because they expand more when they get hot) and I think most OEM forged pistons are 4032 (knock sensor friendly, don't expand as much)

still, why would it be SMALLER than oem?

[dougyfresh]

small port head = gay

I thought Don Supreme had an AEB head to build up? Me'sa confused

[Don Supreme]

I thought Don Supreme had an AEB head to build up? Me'sa confused

I sold one
and
The other one is missing cam caps that I can't find SUITABLE replacements for, so worked up small port it is.....

A lightly worked small port should be good enough for my high 11 sec 1/4 mile goal.... I can't afford to MAINTAIN a 10 second car.

[317ssayzarc]

I sold one
and
The other one is missing cam caps that I can't find SUITABLE replacements for, so worked up small port it is.....

A lightly worked small port should be good enough for my high 11 sec 1/4 mile goal.... I can't afford to MAINTAIN a 10 second car.

ouch!

[Don Supreme]

still, why would it be SMALLER than oem?

Bob says thats that .0015" is from the coating to the wall.

[317ssayzarc]

guessing the coatings about .0005 thick eh?

[Don Supreme]

.001 estimate...

[317ssayzarc]

.001 estimate...

Gotcha... I set mine at .003 measuring the piston as is with a mic, they are coated as well

[dougyfresh]

Missing cam caps. Yup, that head is useless. I think Clint has one of those too.


Which pistons are you using that are coated? 0.001" of coating seems like too much for any internal part. half a mil (0.0005") or less sounds more realistic.

Who's assembling the head? Yourself?

[Don Supreme]

I am just relaying what Bob has told me.

I am not assembling anything.... hahah

We will probably mate the head to the block, timing belts, and accessories, but thats it.

The head is getting oversize valves, new exhaust retainers, and its also very time consuming to work on. I have asked the machine shop to do all of that.

[Don Supreme]

Missing cam caps. Yup, that head is useless. I think Clint has one of those too.


Who's assembling the head? Yourself?

You could probably line bore the caps....

[dougyfresh]

You could probably line bore the caps....

Then there is too much 'slop' between the cam and the bearing caps and journals. You'll need a custom cut camshaft then.

[chris164935]

You could torque down caps from other heads and see if the camshafts spin freely still...

[dougyfresh]

You could torque down caps from other heads and see if the camshafts spin freely still...

and use feeler gauges to check tolerances...


I wouldn't want to spin the motor up to 7k or beyond with bearing caps not worn in on the head they are bolted to. That's asking for trouble in my book.

[Don Supreme]

and use feeler gauges to check tolerances...


I wouldn't want to spin the motor up to 7k or beyond with bearing caps not worn in on the head they are bolted to. That's asking for trouble in my book.

You probably could get it to work just fine, but I didn't feel like taking that risk spinning to 8.5k!

[dougyfresh]

You probably could get it to work just fine, but I didn't feel like taking that risk spinning to 8.5k!

Case and point.

[k0mpresd]

bump. good luck.

[Don Supreme]

Update:
Hell yeah bishes!!!!

[317ssayzarc]

yea boiii!

[AudiA4_20T]

im going to the shop and building this myself if it isnt done for H20