H20 forklift engine parts interchange

[dat68s]

Thanks a lot for the info Plasmaboy... I guess the questions now is which way to go... might do a bit of research and see if anyone has "hotted up" their Urvan. For those that don't know the Urvan is one of those light commercial type vans... As for the L20 option. I really like the idea, but I don't want to get too far away from the "original" concept, and don't want to have to fabricate engine mounts etc. So maybe the H20 is a good option. If I went the H20 way, should I use the R16 head?
Thanks everyone!
Stuart

[S Allen]

I would stick with the H20 head unless you want to have a lot of work done to the R16 head. IE--oversize valves fitted, ported and polished. The H20 should already have larger valves as it is a 2 liter motor. You could put the R competition valve springs in and maybe upgrade the pushrods, stick a hotter cam in it, header and the carburation of your choice and you should be good to go. Anything that bolts to an R motor should fit on the H20 no problems. The Nisssan "Urvan" heh! I guess Urvan is the equivilant of Urban Van or maybe even Suburban Van. What type of a tranny did the Urvan come with? I am sure it was not a 5 speed manual. The blocks and cranks for the H20 forklift are very pricy here in the states. A month or so ago one of the guys was looking for an H25 to put in a roadster. He was having a difficult time locating one in a salvage yard.

Steve

[Minh]

Does anyone know if the that Urvan came with optional differentials???

just curius.

[dat68s]

Since I am going to do some research anyway I'll see what I can find out about the "diff". It actually gets my mind wondering about the 5-speed too, because I am sure that the Urvan's at some stage had a 5-speed, just not sure if it was mated to the H20 motor. I'll let you know what I find out, unless someone already knows?
I was also starting to think about other things, like is it going to be possible to use the bigger capacity H-series bottom ends (from the oil-burners) with the petrol head's etc and then, what about manifolds, will the R16 inlet manifold be able to be used? My thoughts here are that the motors are cheap here and if they bolt straight in, why not a 2.4l, with 5 speed? Anyone know if this will all work? As I say I am going to try and find out more myself, but if anyone has info it's greatly appreciated!
Thanks everyone.
Stuart

[Plasmaboy]

Hi guys .. I know the diff in the roadsters is a datsun H190 . The 720 utility ( and Im sure a few others ) had this as well .. and will go right in place .. but, I know on the 720 , the side gears are different as the axles have a different spline pattern .. so you either have to use your old side gears or get a set of axles made up that match the bigger side gear spline pattern

[dat68s]

Well, I have found out the early Urvan's had 4 speed boxes, but they did get a 5 speed at some stage, which appears to be before the newer motor (Z-series or something) was released, so their may be a chance of using a 5-speed out of one of these too. Anyone have any ideas on the H blocks? as per my last post? I am trying to find info on the Urvan's but it's not something that people appear to have given a lot of thought to. I will keep searching though. So Plasmaboy, have you, or do you know of anyone who has used the Urvan/truck diff with the original side-gears or had new axles made? It sounds like it may be an option?
Cheers,
Stuart

[Plasmaboy]

A member of my club ( DSOA ) http://www.datsun.org.au/ has an H20 in his car .. sorry I dont have much info on it apart from its an almost straight " drop in " . dosent rev as hard as a U20 .. but has a lot of pulling power . If you are going to get to the point of making new axles etc .. especially if you want limited slip .. it might be worth wile getting a whole diff from a later model car with disk brakes , limited slip .. and get it shortened / made to fit ..

[dat68s]

Hey Plasmaboy,
I am a recent member of the DSOA (only got the car a couple of months ago), can you let me know who has the H20 installed so I can contact them about it? Also, I tend to think you are right with the rear-axle arrangements, probably a better option if you are going to the engineering trouble! I am still keen on going the "old fashioned" route with the pushrod H20/25 style option for the motor though so I will still do the research and reading to try and find out more about these motors.
Stuart

[Plasmaboy]

Hi Dat68 .. this is my e-mail address .. feel free to contact me

asmith@stream.net.au

I have done a rear disk brake conversion + commodore vented disks up front conversion if you want some info / pics . as for the owner of the car .. There are several members of the club that are a good sourse of knowledge .. I can give you a couple of names if you get in contact with me via e-mail

Craft differentials in Grandville ( Sydney ) can do a diff conversion .. but expect to pay around the 1500 - 1800 mark .. still compaired to being able to 1 find a LSD diff ( as rare as hens teeth ) and 2 getting it re built + disk brakes , it might be a decent option

[dat68s]

Hi Plasmaboy,

Thanks for the info. I will e-mail you today.
Stuart

[70MTroadster]

FWIW, you might want to look at the H25 specs page on the Motor Power Site. This is the site in Kentucky that is in Steve Allen's general Stroker writeup.

The specs show some differences between the H20. Smaller rod journals, smaller wrist pins, and much smaller intake and exhaust valves, both in the stem diameter and the valve head diameter. These are Forklift specs too, so perhaps an automotive engine might be more "hotrodable".

Looks to me that this 2.5L forklift motor was built for TORQUE!

scott

[dat68s]

Hey Scott,

Yeah, I checked that out and saw the spec's, but my main questions remains then, and that is to use a H25 bottom end, with the head from the H20, will it work? My guess is that the H20 and H25 are going to be very similar with the exception of bore/stroke (and the other things you mentioned), so a H25 bottom end with a "petrol" H20 head etc. should work? Then for cam's and carbies/exhaust we can use the "good" bits from an R16?
What does everyone think? Will it work?
Thanks!

Stuart

[S Allen]

Stuart,

It looks like it is going to up to you to find the answers. Having never seen an H25 and quite likely I never will. My stroked R motor runs good enough for me. The H20 and R are very similar. The H25 is still a push rod affair so I am sure an R head would mate up but I am only going on pure conjecture. I have never heard of anyone stateside running an H25. Like I said a fellow was looking into it a few months back but came up empty. Keep us posted on your findings please. Good luck.

Steve

[Dan Zubkoff]

As I've mentioned earlier, my 67.5 2000 currently has a H20 JDM engine.

These appear to still be available in japan for export.

Here is a company that stocks used engines in Japan.

http://www1.sphere.ne.jp/delmundo/offer/offer.htm

I'm pretty sure these are from the datsun homer/urvan/caravan, and not of the forklift variety. But buyer beware and make sure it isn't the forklift version.

Dan Zubkoff
San Mateo, CA

[S Allen]

Dan,

Thanks for the info. $650.00 plus shipping does not seem too bad for a used H20 motor. Japanese motors tend to be pretty low mileage for the most part. It might be a workable alternative.

Steve