Anybodywith stroker/rebuild kits based off 2.8's?

[JT87]

Hey everyone,

The engine in my Fiero is definitely on its last legs (310,000 kms later, i couldn't really expect much more)...

Long term, I'll be looking at doing an LSx swap, so I'd rather not go the L67 route (although popular, can be time consuming, especially while I'm still in university... plus it requires investing in new mounts, a custom flywheel and a new clutch and pressure plate, among other things)...

I was looking around at performance builds for 60 degree motors and found a few sites that had stroker performance kits that seemed interesting...

Have any of you had experience with stroking out your 2.8's? suggestions on what to look out for? Can you give me a cost estimate?? (all work being done in house) what kind of power increases have you seen from using a performance stroker kit (in combination with doing some head work???

Thanks!

JT

[sharkey]

a stroker 2.8l is a 3.1l. basicly swap the crank and pistons into a 2.8l, and you have a 3.1l. the downside to this is the avalibility of 3.1l ironhead pistons, you can get stock replacments, but thats about it. if your not planning nitrous or boost, then this route should be alright.

best thing to do would be the 3.1l crank and pistons, and go with a comp cams 260h2 cam kit (the complete kit with cam, timing chain, springs, locks, retainers). porting the heads helps a bunch. headers also wake the motor up a bunch.

[johnnymossville]

I'd consider a 3400 swap, more HP and torque. I believe that it will bolt right in. A few members here could tell you what you would need.

[JT87]

a stroker 2.8l is a 3.1l. basicly swap the crank and pistons into a 2.8l, and you have a 3.1l. the downside to this is the avalibility of 3.1l ironhead pistons, you can get stock replacments, but thats about it. if your not planning nitrous or boost, then this route should be alright.

best thing to do would be the 3.1l crank and pistons, and go with a comp cams 260h2 cam kit (the complete kit with cam, timing chain, springs, locks, retainers). porting the heads helps a bunch. headers also wake the motor up a bunch.

I was looking at picking up this stroker setup (the one on the left hand side):

http://www.engine-parts.com/GMV6/gmv6ps1.html

It comes with:
-2.8-3.1L Basic Stroker Kit (Includes Stroker Crankshaft, Pistons, Rings, Main Bearings, Rod Bearings, and Connecting Rods)
-Hypereutectic Pistons
-Phase 2 Camshaft & Lifter Kit
-Clevite Cam Bearings
-Brass Freeze Plugs
-Roller Tip Rocker Arms (1.52 ratio)
-Fel-Pro Complete Gasket Set
-Double-Roller Timing Set
-Stock Oil Pump
-Head Bolts
-Stock Pushrod Set
-Timing Chain Dampner

With this kit, in addition to a custom intake and ported lower intake and heads, and long tube headers, what kind of numbers should I be getting?

[LeftVentricle]

With this kit, in addition to a custom intake and ported lower intake and heads, and long tube headers, what kind of numbers should I be getting?

Hard to say... A Fiero 2.8 (VIN Z, isn't it?) puts out the same power as a 3.1 because it's got larger valves. Vanilla (VIN W) 2.8 makes 125 hp, stroking to 3.1 adds 15 hp, or 140. Baseline might be 155 at the crank with just stroking, and just by eyeballing what else you want to do I'd say you're probably gonna be at around 170-175. Don't quote me on that though.

I've got a 3.1 Celebrity wagon and I've been toying with the idea of slapping on those VIN Z heads. Is that a viable option?

[sharkey]

actualy, all fuel injected heads, ho or not, have the larger 1.72/1.42 valves. in the years of carbs, the HO in the citation x11 had the larger valve heads, were non HO motors were 1.6/1.3".

the difference with the fiero HO to other 2.8l was it had higher compression (8.9 vs 8.5) and a more aggressive cam. now in the case of a 3.1l stroker with ironheads, you will likley end up with 8.5:1 compression, and a slightly better cam you will end up a little better than a 2.8 ho, id say 150hp max with what you have planned.

its hard coaxing power out of an ironhead motor, the intake doesnt allow it to pull above 4500rpm stock, it gets worse with the more air you try and flow through it.

btw: ironheads on a gen 2 motor nets you around 7.2:1 compression, and the aluminum genb 2 heads have the same valve size, better combustion chamber, and better ports than an ironhead motor. and iirc, a fiero 2.8 ho is actualy vin 9