Engine rebuild

[mustardjerp]

OK, I've come to terms with the cost of a rebuild for my 2F. Now I'm trying to decide between an OEM rebuild or a 4.7L stroker rebuild by a local machine shop. Advantages would be obviously more torque and hp but will I lose anything on the resale end if I ever decide to resale and don't do an OEM job. This machine shop is well-known for its work with hi-performance engines so I think they can do a great job, but man it is going to be expensive. Anyway, thanks for helping a newbie.

Jerry

 

[CruisinGA]

I don't think you will lose any resale, most people would rather have more power than less.

Bore it, bore it, bore it!

 

[Poser]

4.7L stroker rebuild by a local machine shop.

Typo?


5.7?


Which 4.7 engine were you going to have stroked?

 

[Poser]

Resale?


What the hell is that?

 

[mustardjerp]

He told he me he would bore it out to 4.7L for their stroker kit. I'm thinking it would be worth the extra few hun to do it. But I'm a novice in the realm of FJ 40's. I've definitely got the bug though.
Jerry

 

[DocB]

Someone makes a stoker kit for a 2F? I thought this involved a bigger crankshaft and shorter pistons , for instance , a 400 crank in a 350 to make a 383. This gives it a longer stroke, hence the name. Bored out does not mean stroked. The 2f already has a very very long stroke ; that's why its so great at low RPM and keeps chuggin.

 

[Poser]

Someone makes a stoker kit for a 2F? I thought this involved a bigger crankshaft and shorter pistons , for instance , a 400 crank in a 350 to make a 383. This gives it a longer stroke, hence the name. Bored out does not mean stroked. The 2f already has a very very long stroke ; that's why its so great at low RPM and keeps chuggin.

4.0" stroke

 

[Poser]

Oh...

and welcome.

 

[mustardjerp]

DocB,
So are you saying that you would just go with OEM parts for the rebuild? I was under the impression that the 4.7 stroker would require some boring out to get the displacement but I will investigate further. Can you get 4.7L from a 2F without boring it?
Thanks,
Jerry

 

[Poser]

The only way to increase the displacement of the 2F is to increase the diameter of the bore....


In order to increase the stroke of an engine, the distance that the piston travels must be increased, and to do that with a 2F, would require a different crankshaft, and different connecting rods.

 

[Mark W]

You *could* off center grind the rod journals on the crank. You would still need shorter rods or shorter pistons. And different rods either way with smaller "big ends" to match the smaller crank journals. Expensive and almost certainly not worth it for .5 liters (30.5CI) of displacement gain.

Just do a basic compression/cam/intake/carb/exhaust/balance hot rod of the engine and you will be plenty happy. And have a much heavier wallet too.

 

[tonkota]

You get about 1.19 litre per 1mm over bore. And I think you can bore out as far as 2mm?

 

[Rice]

Is this information coming from your machine shop? I think I'd be very suspicious of the guy telling you what he's going to do for that engine. There is no way it can be bored to 4.7 liters and stroking it is not only goofy but would cost way more than a couple hundred.

Run, don't walk, to another shop!

 

[Mark W]

You get about 1.19 litre per 1mm over bore. And I think you can bore out as far as 2mm?

Better check your math. A 1mm overbore (equals .040) gives you a gain of 5ci (81cc, or .081 liters).

Makes you 4.2 liter engine a 4.281, or 4.3 if you round. 263 ci.

Think about it. Iy we could turn out 4.2 liter engines into 5.4s just by overboring, there wouldn't be a stock 2F blockleft to find. And if a 6.6 liter 2F was a possibility...!

Toyota lists a 1 mm overbore as an option. I haven't seen any pistons this size (but I haven't looked either.

I have never heard anyone mention a 2mm over size piston for this engine, and would be amazed if there were any out there. I doubt that the cylinder wall would survive this much removal without letting the piston become aquainted with the water jacket.