13:1 Compression 3.3L cam'n its ass off

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zach44102

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Well after popping another transmission and destroying a axle I decided to retire the blue turd for the winter. Planned on quite a few upgrades but then I decided if im going to do it I better do it right. So here is a little preview of what I have planned to push my N/A SHO to new heights.

So I started by pulling out everything.

 F0EF 461F A774 FE6CF6708C1E 2705 0000027AE2738976
 F41E 4C9E B384 DA3168869361 2705 0000027ADCA201D0

Out with the old Southbend Stage II clutch

 5213 4169 8D7C 1BC684BF6C66 2705 0000027AD7119C28
 01C3 4172 B647 A8F6C5059F31 2705 0000027B79C5C0E6
 A923 4F45 900E 94E60A8B4DDD 2705 0000027B7D360A98

Ok, then I started disassembling the transmission. I destroyed 3rd/4th syncros and have been beating on it pretty hard even with zero syncro left. Here are the carnage pics.

 628D 4E56 B8B8 D6C214AD30D0 2705 0000027A89D7ABFF

Piece of syncro LOL
 D458 4E49 A969 20C6D607C652 2705 0000027A8F8D0F81
 DFBA 4554 ACAE A7E51B54B0C0 2705 0000027A94ABC003
 C20D 4342 9069 22222EB3B1F7 2705 0000027A998B1444
 0E34 4AED A014 33419BD1E494 2705 0000027AAEC3321C
 1B8C 41CD ABBE 6B003EE0F948 2705 0000027AA8A0162D
 40EB 4C42 96E8 8880579B85F5 2705 0000027AA2286830

STL SHO ring welded diff. I love this diff with a passion.
 223D 472A A699 83CFE708F06F 2705 0000027A9DE05D63

Then I started tearing down the motor.
 B2F4 4206 B607 D479D07F7A2A 2705 0000027AB3BF0E5C
 638E 43C5 90AA D5277970547B 2705 0000027AB8952C65
 2BEB 4F5D B873 0DD8C265BAAB 2705 0000027AC2A290C8

Then I discovered this. This is DEEP.
 D1DF 4E39 8418 0BE0841C0F99 2705 0000027AC7867146

Now for the good stuff.

So now seeing that gouge it changed my decision to keep my 92mm bore. I spoke with wiseco over the phone the other day so I could get just a quote on some pistons. I have decided to go with a 12:1 compression forged piston with for a 93mm bore. The heads are getting completely disassembled, Going to port and polish the heads, remove all casting marks, bowls blended, intake ports finished to a 120grit, exhaust ports mirror polished and then assembled with new valve stem seals and SHOSHOP Stage II cams. The intake manifold will be hogged out and port matched to the heads. Gutting the secondaries and just leaving the 40mm housing since the car is never below 4000rpm.

Goals on race gas to make somewhere around 280-300whp. Then plan on putting all the power to the ground with 255/50/16 Sticky Micky's.
The weight of the car will also be a little less then before. Weight should be around 2620 pounds.
 

TimboSHO

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That's quite the carnage for a car that still runs 13.5's. Imagine how fast it will be if stuff isn't broken :):evilgrin:
 

jayro

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Good luck with the build. 300whp would be quite a feat.....between 350-360 at the crank. That engine in gonna have to rev like crazy and still make decent torque that far up in the RPM band.
 

VortecGT

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You sir need a HD gearset, that worries me because even being N/A your still killing the trans! Good luck on the build!
 

SHOdded

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How did the cylinder get scored like that? How are you going to prevent it from happening again? Just need the trans to hold together for more than 1 second now :)
 

zach44102

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Im not sure exactly how it got scored but i bet you it has been that way ever since i first started the motor considering it make lots of wierd not so good sounds. A piece of gravel, glass, or sand had to had fallen down in the cylinder.
 

zak

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Somewhere I have a part number of a valve guide that fits the SHO head (and valve) that has a tapered, as opposed to square end where it enters the bowl. This helps flow a bit.

I think you will need to enlarge the diameter of valves and seats on the secondary intkae ports (maybe you've already done so) and enlarge either one (opposing) or both exhaust valves/seats.


Can you afford a 5 angle valve job?
 

quikSHOilver

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Dude, I am quite surprised that you still retain that A/C, bypass that crap hence MOAR powah to you! Lol. Keep it up!
 

jayro

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You sir need a HD gearset, that worries me because even being N/A your still killing the trans! Good luck on the build!

I am pretty sure that the trans killings are due to shifting habits more than gear strength. It is possible to shread 3rd in NA form, but it is far less probable.
 

zach44102

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I use to no lift shift the transmission until it popped 3rd gear syncro. My power has not broke my transmissions, its the driver mod ;)
 

luigisho

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Slap yourself in the forhead and say "I could have had a V8".

Spending the same money, I think you would get alot more driving enjoyment with a better buildable powertrain platform . If you had a ton of cash I'd be 100% down with whatever, but I think you should consider getting 400-500 hp with similar $.

What I'm thinking about, running around with my hard as heck to find t-bird ford racing cobra type wheels, is what if I screw one up and essentially make the other 3 about useless. If you get a one off set of Wiseco pistons and one cylinder goes kablooey, will they make a single replacement and at the same price point? This doesn't sound like a great use of dough on a budget. Just food for thought.
 
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zach44102

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I dont want to go 10.6:1 everyone else has gone 10.6:1. Thats not really that high of compression and wont show much gain for 850$. And if i was to go 10.6:1 its going to cost the same as going 12:1. 132$ a piston. So with that being said i can only really save money if i kept the 92mm bore skipped the machining and just threw in some pistons. but i cant do that anymore unless i get another block now. so i might as well go 3.3. I need to do some research and expand my knowledge which im really looking forward to. This is less of a plain out horsepower build and more of a assemble my first motor and learn.
This car has done nothing but teach me things and i want to expand that even more.
 
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zach44102

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Its not being the fastest or winning races or any of that that pushes me to spend the money. The quarter mile times, and all that is just a bonus. The reward is definitly the knowledge that i gained to put me where i am.
 
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