Datsun Roadster Forum-311s.org

well the honda h22a rods are
(1.890" Journal, .935" Width, .866" Pin.)

Rods length 5.630" (143mm)

the journal size is of course 0.412 smaller but you have the crank ground down to that size and thats another 0.412 worth of stroke!!! (off set)

custom pistons maybe in order or just cutting down the h20 pistons..

depends on alot of factors...the rods are shorter 0.04

so the piston (if at 0 deck) would only be sticking out at 0.166.

i don't know if that is alot with those pistons and a stock head.

that would make a 2851.35cc motor!!!! Almost a 3L!!!!!

yes it would take some work..but you could easily get 200hp off a motor that big!!
maybe even more.

If i made a wrong calculation please let me know. I don't know how much the h20 pistons are able to be cut (off the top)
and how much it would cost to offset grind the crank.

the rods are only $300...$320+ for a stroker crank (cheaper if a U20 crank, if you have one)

And i also don't know how wide the rods are.

Any other suggestions?

thanks
steve

looking back i made some wrong calculations!.
it would add .824 of stroke making a 4.092 stroke crank..this will yeild 151.5ci or over 2400cc..

pistons are a problem now tho'

steve

Steve,

Correct me if I'm wrong, but if the journal size is 0.412 smaller, aren't you are only going to increase stroke by 1/2 that, or, .206?

Also, can you feasibly grind that much off your crank journal? Seems like a lot to me!

The Buick/Olds/Rover 3500 aluminum V-8 conversion is seeming like less and less trouble. Granted, a turbo 4 cyl might make more usable power, but V-8's are just more fun.

acutally it will double the size. but it is way to much. not really worth it now that i look back at it. The turbo route is alot easier it seems.

The v8 is good i have a 70's v8 plymouth. but its to big..after headers that is.

Where can you get rover parts in the us? is it really that easy to get a engine here?

steve

Actually.... when you grind the journal offcenter to increase stroke, you are moving the centerline out, since the center is 1/2 the distance from journal edge to edge, the centerline is only moving .206". But the net effect is the .206" at the bottom and the top of the stroke. So it's only the .412" increase in stroke. In a round-about way.

On with the discussion....

The rover 3500 engine is a Buick 215 cu inch all aluminum V8 used in the early 60's. They are not hard to find, and there is alot of parts availibility. They used twin SU's on a cross ram type manifold, but the Buick used a regular 4 barrel. I've seen them for a few hundred dollars for engine and trans.I think you can stroke them to 300 cu inch with factory parts. The cool part is it is actually lighter than the 4 cylinder Datsun engine. Saw one in a Spitfire, that was really nice.

The really cool motor is the Daimler 2.5 liter Hemi, they are popular in England for hotrods. Basically it's a scaled down Chrysler Hemi. That would be a hard one to get, but WAY cool.

Steve,

Remember Art posted a 2 liter crank, rods and flywheel for sale and the price is right. You get a totally counterbalanced crank with the 2L, not with the H20 or H25, so I say the 2L is far ahead in strength and longevity especially when you are brainstorming so much of a horsepower increase.

Why not use the 2L crank with the H25 rods? This would give you a stroke increase from 83mm to 93mm, and a capacity of 2262cc's. You'd have to get custom pistons made.

Or, just get the stuff from Art for a cheap 2L stroker using the Motor Power H20 pistons, everything fits, and you could then turbocharge. As long as you didn't get crazy with the boost I'll bet the engine would hold up well.

With money, you can do anything you like, that's for sure.

My 2 cents anyways.

Scott

Sorry, not paying attention. 83mm stoke regardless of rod length. promise not to post again until get over being stupid.