Looking for 2.5 engine on 86 fiero vin r
I just checked Ebay, and there are two listed. You might try Craigs List.
(Tips from me:
Port the Vortec head. Open the Intake and Exhaust ports, by smoothing them out, and smoothing the casting sprue lines out.
Put the Intake gasket, and the Exhaust gasket on the head, (After marking the area with Prussian Blue)
Scribe the opening of the gasket, onto the head, then match the ports to the scribed lines.
You also should round the valve guides top surface. (Where the valve stem meets the guide) There is a square edge that needs to be rounded. This square edge interferes with the fuel/air mixture, as the sharp edge breaks the fuel/air mixture down into droplets.
You want to keep the fuel/air mixture atomized, Not droplets.
Also narrow the casting that comes up the side of the valve guide. (Squared off shape that follows up the guide, and makes the Vortec shape swirl shape in the Intake port) Narrow it to more of a small rounded edge.
Do not polish the Bottom of the intake ports. Leave them as a rough casting. Smooth, and polish the Sides, and Top of the Intake port. (Do not get Extreme! You'll go into the water jacket with your die grinder! Factory may have had a casting shift that day. Just smooth things up)
Makes a nice swirl pattern for the fuel/air mixture.
If you polish the floor, (Bottom), of the Intake port, you will create Two swirl patterns, and they will collide with each other, making droplets again. (They cancel each other out. You want one nice swirl pattern flowing through the Intake port)
I can bring my 1985 Fiero up to 155Mph, (On dragstrip set up for this, tires, and proper safety equipment used). I can also 'Keep my foot' out of the throttle, and get 45 miles to the gallon on the highway.
You can use flat top 350 Chevy pistons. The 2.5 Vin R Fiero engine has a 4 inch bore like a small block Chevy. The pistons can be put on the Fiero rods. Same wrist pin size. The piston drops down into the engine block, about .030 below deck height.
(Wrist pin to piston crown height, is .030 shorter with 350 Chevy piston, compared to stock Fiero piston. You can buy 4 - 350 Chevy pistons AND rings, compared to the price of just the rings, for a Fiero!)
(Thirty thousandths. Real close to 1/32nd of an inch. .03125 is 1/32nd of an inch)
Fiero's have dish head pistons, so the drop in deck height, and using a Flat Top 350 Chevy piston equals out. (Better flame travel with flat top piston. Better burn, more power. Uses more of the fuel/air mixture than a dish head design)
If you can't afford to have them balanced, use a beam scale, and balance them yourself.
I can bring my 1985 Fiero up to 155Mph, (On dragstrip set up for this,
and proper safety equipment used). I can also 'Keep my foot' out of the
throttle, and get => 45 miles to the gallon on the highway. (Throttle Body Fuel Injection. TBI)
Makes a V6 Fiero cringe!
Sep 14, 2009 |
1988 Pontiac Fiero