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Re: H95 "Small Oval, Shrouded-Port" head |
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No life (a.k.a. DattoMaster) ![](http://datsun1200.com/uploads/rank49ca09456da4d.gif)
Joined: 2001/2/7 2:29
From Fort Worth, Texas, USA
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Quote: D wrote: Can you please post up some pics of this rare head, I really like the super deep tub chambers they are like some of the Harley aftermarket head combustion chambers focusing the charge in the centre of the piston with little wasted on the bore walls of the engine.
I will see what I can do... which translates into asking Tensandtwenties to do it for me since I am just barely computer literate.
Posted on: 2012/6/27 20:39
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Re: H95 "Small Oval, Shrouded-Port" head |
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No life (a.k.a. DattoMaster) ![](http://datsun1200.com/uploads/rank49ca09456da4d.gif)
Joined: 2001/2/7 2:29
From Fort Worth, Texas, USA
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Quote: ddgonzal wrote: You can get new double-valve springs from Isky, Bprojects, Kameairi, etc.
The stock Nissan ones are the best since they are for 7000 RPM. The aftermarket ones are for 9000 RPM so wear the guides out faster.
peterzekert.com might still have some. Bproject is $100/set.
I have run the double valve springs before. I feel I should run them again in this engine but... um, well, I guess I don't have an excuse why not.
Posted on: 2012/6/27 20:37
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Re: H95 "Small Oval, Shrouded-Port" head |
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No life (a.k.a. DattoMaster) ![](http://datsun1200.com/uploads/rank49ca09456da4d.gif)
Joined: 2001/2/7 2:29
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Quote: ddgonzal wrote: This is to go in your hicost?
Hicost! Funny. No I took it out of the Seven when it was too loud, buzzy, high-strung, and generally annoying. It is now in a B-210 called Lil' Wiggly... and proved to be too loud, buzzy, high-strung, and generally annoying.
Posted on: 2012/6/27 20:35
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"There are 10 kinds of people in the world, those who understand binary, and those who don't.
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Re: H95 "Small Oval, Shrouded-Port" head |
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No life (a.k.a. DattoMaster) ![](http://datsun1200.com/uploads/rank49ca09456da4d.gif)
Joined: 2001/2/7 2:29
From Fort Worth, Texas, USA
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Quote: ddgonzal wrote: by the way, the H95 valves are only 3.8 mm shorter...
Oh, I see that in the tech wiki now. Ok, to be perfectly honest, that 1/4" (6.35mm) was a wild-ass guess, based on observation from across the shop, while being held back from smashing the crap out of something.
Posted on: 2012/6/25 19:51
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Re: H95 "Small Oval, Shrouded-Port" head |
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No life (a.k.a. DattoMaster) ![](http://datsun1200.com/uploads/rank49ca09456da4d.gif)
Joined: 2001/2/7 2:29
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Quote: ddgonzal wrote: Quote:It is totally worthless for a street engine. Is that because the ports are now too big, needs very high RPM? How would it work on a 1608 engine? Or an A15?
Yes... well, we hope that is the issue. We think the ports are just so huge now that they don't have any gas velocity until the revs are way up there. I know who built this bottom end and don't really want to grenade the thing. Not to mention, I don't like sounding like I'm flogging it for all it is worth just to keep up with a Subaru Justy. The engine is a 1400 so I'm not sure if another 100/200cc would help all that much. I am glad to know that I'm not crazy and that the valves ARE in fact shorter. I just wish I'd known it before we assembled everything. An addendum to the tech wiki might be in order. I'd do that but I'm just barely computer literate, as y'all may remember.
Posted on: 2012/6/25 19:46
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"There are 10 kinds of people in the world, those who understand binary, and those who don't.
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H95 "Small Oval, Shrouded-Port" head |
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No life (a.k.a. DattoMaster) ![](http://datsun1200.com/uploads/rank49ca09456da4d.gif)
Joined: 2001/2/7 2:29
From Fort Worth, Texas, USA
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First off, sorry I've been away so long. I have no excuse.
Now, on to my question/observation/issue:
A few years ago I had an H95 "Small Oval, Shrouded-Port" head ported within an inch of its life. It is beautiful. It flows ridiculous numbers. It is totally worthless for a street engine. Last week I decided to remove it and put on a "stock" oval port head to try and make the car driveable. My plan was to pull the valves and springs from the super hot rod head (aka $1,000.00 Albatross) and put them in the unmolested oval port head. (Sorry, I don't have casting numbers at hand.) Well, to my surprise, the H95 "Small Oval, Shrouded-Port" head appears to use a much shorter valve and spring package than other A-series heads. Like 1/4" (0.250" or 6.35mm) shorter! Do I have some weird bastard of a head or or has anyone else come across this situation? Is it possible that, since the ports are so badly shrouded, NO ONE has ever done anything with this head?
Fortunately, in all my hoards of junk... I mean spare parts, I did find a full set of "long" valves and springs and will be able to build a decent stock head for this engine.
Unfortunately I didn't discover the valve issue until the head was installed on the block and we went to install the rockers. (Hint, if your valve lash is 0.250" [6.35mm] instead of 0.010" [0.254mm] you may have the short, H95 "Small Oval, Shrouded-Port" valves in another head.)
Posted on: 2012/6/24 2:30
Edited by dimlight65 on 2012/6/25 19:51:53 Edited by dimlight65 on 2012/6/25 19:52:44 Edited by dimlight65 on 2012/6/27 20:44:26
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Re: Single 40 Dellorto VS Twin Hitachi SU's setup |
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No life (a.k.a. DattoMaster) ![](http://datsun1200.com/uploads/rank49ca09456da4d.gif)
Joined: 2001/2/7 2:29
From Fort Worth, Texas, USA
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I agree with the rest of the folks who have replied. When I swapped from the single Weber 40 DCOE to dual Hitachi SUs on the Seven, it was like a night and day difference. Lots more torque, better driveablity, and stuff like that. I want to say the "intake honk" sounds better as well, but DCOEs are known for a sweet WOT rort.
Posted on: 2008/8/6 23:49
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Re: all right which of you aussies did this? |
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No life (a.k.a. DattoMaster) ![](http://datsun1200.com/uploads/rank49ca09456da4d.gif)
Joined: 2001/2/7 2:29
From Fort Worth, Texas, USA
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Quote: DatsAndy wrote: Yeah Luvdat whats with that Avatar man ? My girlfriend is picking her brain as to where she knows it from.
Gosh! It's Napoleon Dynamite doing whatever he feels like!
Posted on: 2008/7/26 0:01
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Re: CHEAPEST PRICE PAID FOR A DATSUN |
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No life (a.k.a. DattoMaster) ![](http://datsun1200.com/uploads/rank49ca09456da4d.gif)
Joined: 2001/2/7 2:29
From Fort Worth, Texas, USA
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Paid five US dollars for a somewhat rusty 1200, sold it within 24 hours for $50.00 then traded a B-210 for it and $500.00. It took a tank of fresh gas, cap-rotor-wires-plugs, and a new battery to make it run. It was our "shop whore" for quite some time until it burned (burnt?) an exhaust valve. Somewhere in the photo section are pictures of that engine after all the machine work was done. It is back in the car now and should be running sometime, um, this year?
Posted on: 2008/7/1 0:23
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Re: Finally fingered it out |
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No life (a.k.a. DattoMaster) ![](http://datsun1200.com/uploads/rank49ca09456da4d.gif)
Joined: 2001/2/7 2:29
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It is a replica of a Lotus Seven Series III by a South African company called Birkin. They usually run a Ford Zetec engine but I had to use a Datto. Mine has an A-15, or at least the bottom end of an A-15 right now! I run the dual SU GX intake setup and figger I got about 110 or so horsepower. We ran the car across the scales and it weighed 1150 pounds. Let's see that would be, um, carry the two, 522.73 kilograms, give or take. So it's fun to say the least!
Posted on: 2008/6/11 23:40
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