7a help, so i need some help .....in april i start school at wyotech when im t Options

[Trae]

so i need some help .....in april i start school at wyotech when im there im building my 7a im thinking head work 4a rods and pistons clutch ..... do you know anything about put 4a rods and pistons in a 7a does the block have to be bord whats the stroke on a 4a what sthe 7a stroke is it true the 4a rods and pistons are good 4 300 hp if i got my ecu remaped would the stock crank hold up at 75or 8000 rpms what would i need to do about fule ..... with that motor built cuold it hold up to a 75 shot...... most of my motor experience is with v8s so building a 4 banger is new to me so any help i thank u 4

[phonex98]

English please, or at least some sort of punctuation.

This post has been edited by phonex98: Jan 2, 2007 - 8:43 PM

[Bitter]

7afe and 4axx have the same diameter bore, stroke difference is in the crank throw. 4axx rods wont work, the crank journal on the 7afe crank is a larger diameter iirc. however 4axx pistons will work, the piston bosses have to be machined to fit the 7afe rods.

speaking of rods, its about $700 a set for 7afe rods from...i think its eagle.

[Kwanza26]

so i need some help .....in april i start school at wyotech when im there im building my 7a im thinking head work 4a rods and pistons clutch ..... do you know anything about put 4a rods and pistons in a 7a does the block have to be bord whats the stroke on a 4a what sthe 7a stroke is it true the 4a rods and pistons are good 4 300 hp if i got my ecu remaped would the stock crank hold up at 75or 8000 rpms what would i need to do about fule ..... with that motor built cuold it hold up to a 75 shot...... most of my motor experience is with v8s so building a 4 banger is new to me so any help i thank u 4

An engine is an engine. The mechanics of building one is the same. Since you're going to Wyo Tech... I sure do hope you get better acquainted with the engine basics before you start making plans to build an engine.

Anyhow... 7A specs are EASY to find... as are 4A's. Basically... you cannot use 4A rods, which are too short for the deck height of the 7A block and the journals on the rods are too small for the 7A crank. No... you cannot use the 4A crank either. As for the crank... how often do you hear stories of cranks exploding under pressure? Sure cranks do get damaged... but usually from broken rods/pistons and hardly ever the crank itself. Stock 4A pistons are NOT good for 300 hp... at least not with any stock set-up or nitrous.

My advice... research.