Thanks ole buddy Dan.













It Aint Over Until I Win

I just picked up a 71 225 and 904 transmission off craigslist for $25. That is not a typo $25 and he loaded them into my truck. LOL

I just love off the wall swaps like this C'mon rammingspeed keep us updated on the build, don't leave me hangin!!

_________________
To each his own (so what if I wanna build a 450 horse MPFI turbo /6 instead of using a V-8!)

Right now I am going over different parts combos.

If I use 2.2 turbo pistons and stock 6.7" rods I am estimating the pistons will be about .315-.331 below the deck. Stock builds average about .140 with a CR of 8.4:1. I think this will put me at or just below 8:1 CR, which is what I am looking for. Any corrections would be appreciated

Most stock 225s have the pistons about .180-.190" below deck and have a true compression ratio of 8.0:1 or less. If you use a shorter piston you need to use a longer rod to have a reasonable compression ratio. The primary reason for using the 2.2 pistons is to allow the longer rods without resorting to custom pistons.

_________________
Joshua

Thanks for the info. I guess I'll shave the deck to get closer to 8:1. I don't think rods that are .3" longer will make enough difference to justify their cost.

Why not use stock replacement pistons? You want a stock compression ratio after all.

_________________
Joshua

Will they hold up to boost as well as the 2.2's?

For boost, you'll want a forged piston..........

_________________
Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

There are quite a few people on the turbo dodge forum running the cast pistons at 18+ psi. I would agree that forged pistons are the strongest but I'll probably only run about 15 psi on this motor. I plan on spending the bulk of my budget on intercooling.

The Crossfire is heavily based on the previous generation SLK Benz. The powertrain is all Benz. That is part of why the AT is so expensive to rebuild. If there is a more complicated way to do it, Daimler Benz will find it. lol.

No aftermarket support for the 3.2? For body stuff for the Crossfire I agree. For the powertrain, I have to strenously disagree. AMG? If you don't want to go Afalterbach, try Renntech.

http://www.renntechmercedes.com/slk_170.php

IMHO going from a modern V-6 to the 40 year old design /6 is a step backwards. I suggest looking for a shop that will let you send in your AT as a core and ship you a fresh AT for a fee. The tranny has been used across model lines so it should be easier to find than an AL /6, for instance.

Good luck to you in Huntspatch.

_________________
You can't fix stupid. - Ron White

That doesn't sound like any fun at all.