2.8 MFI questions...?

[rexav8r]

What does it take to build a 2.8 MFI motor ?

I hope that's not TOO open ended of a question...
What case is best suited ?
What P&Cs ?
What rods ?
What crank ?
What cams ?

Not a radically wild motor, something that has a realistic life span and can run on pump gas (even if it's premium pump gas)

I'd like it to bolt up to a 901 tranny and fit in a stock 1970 narrow body long hood.

I have a disassembled MFI 2.2S motor that can be used as a donor. Can the MFI pump be recalibrated for 2.8?

Can the 2.2S case be used for a 2.8?

I can get the part numbers if needed, but don't have them written down right now.

Thanks...

[Steve@Rennsport]

Richard,

2.8's can be built from two combinations of pistons and crankshafts: 92mmx70.4mm & 95mmx66mm.

The former is done on either an early 2.0 aluminum case or a mag case, perferably a 7R one. The latter combination is done using an early 3.0 Turbo case and 95mm P/C's with an early 66mm crank. Rods will depend on which combination you choose.

One can use either 92mm Mahle RSR P/C's (best for durability) or JE pistons in an aftermarket cylinder. The RSR pistons require twin-ignition as well as some modifications to get the CR into pump-gas range. Naturally, JE's can be ordered with any compression ratio you want.

Your MFI pump can be recalibrated to work.

JMHO, but I would not use your 2.2 mag case for this. An early aluminum case or a mag 7R are much better choices. The 3.0 Turbo case with 66mm crank is very durable.

[kenikh]

One option Steve didn't mention: Get a 3 liter from an SC and buy some Nickie cylinders and matching 92mm pistons to get a 2.8 with a 9 bolt crank and heads that don't need a bunch of port and valve work. You do give up some displacement for posterity, so most just stick with the 3.0.

Don't bore a 2.2 case for 92mm P/Cs. All you'll do is end up crying when you break the engine and ruin your valuable S case.

[mjshira]

what kind of power does an engine like make?

[BigD9146gt]

Originally Posted by mjshira

what kind of power does an engine like make?

I've asked the same question over and over. I mostly hear a realistic ~250 crank hp for mine, but I can't wait to dyno my build: 3R/4R case, 2.7 crank, Mahle RSR P&C's, DC60's, mod MFI pump 2.7RS, ITG filters, 2.8 MFI injectors, twin plugged with Patrick Motorsports rotor setup, MSDS 6AL, heads ported 36mm Int/Exh, MFI stacks ported to match.

one day... soon! Who has an engine dyno near SLO or South Bay Area? Cost?

[Steve@Rennsport]

Originally Posted by mjshira

what kind of power does an engine like make?

There are many variables here: cams, compression, heads (a biggie), exhaust system, and even the MFI pump, all affect what kind of power you get.

A 2.8 can make between 240BHP to 275BHP with streetable camshafts.

[Henry Schmidt]

There is a least one another option that has been over looked.
You can build a 2.8 using a 3.0 and 3.2 core and installing the Supertec 66 mm SuperCrank.
Benefits include late style oil, use of GT3 Titanium Pankl rods, good parts availability and stable case platform.
You also get the benefit of a nine bolt crank. If you want to rev your project, 2.4/2.7 crank are woefully inadequate.

[BigD9146gt]

Henry... that crank is SOOOOOOOOOO HOT! TOOO SEXY!!! Want to touch it! Oh well, next motor...