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   All Posts (racer135)


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Re: H89 vs gx head
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From what I've read so far in the book I mentioned earlier, square ports have poor flow characteristics. I think the only reason most manufacturers use square ports is because of space limitations. Chev did it because of the pushrod location. I think the book even mentions filling them to an oval-ish shape drastically improves the flow. Definitely worth having a look at the book.

Posted on: 5/24 5:37
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Re: H89 vs gx head
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In the not too distant future I'm hoping to try a few different standard heads on a 'control' engine in a car on a dyno to see what figures each one makes.

I'm also hoping to port a round port using the info from the book 'performance 4 stroke tuning' by A. Graham Bell to see how it goes vs standard.

I don't know of any places near me to test them on a flow bench unfortunately, would be much better I'm guessing, less variables and whatnot.

Surprised after all these years that noone has done it before and posted the results in tech wiki.

Posted on: 5/23 9:54
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Re: Datsunbeginner becomes an expert - Vanilla Ice ute build USA
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Quote:

ddgonzal wrote:
Yes, you are correct. In USA we never got the "new" mid-distributor A12 -- ever. We did get the A12A in the base B310

A12 1171cc
A12A 1237cc (+2mm bigger bore)

In New Jersey, A12A is more common than A12

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So your Pulsar/Cherries and B210's never had the late A12's?

Posted on: 2018/11/21 11:43
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Re: Datsunbeginner becomes an expert - Vanilla Ice ute build USA
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A12A is not the designation for the mid dizzy motors. A12A is an uncommon version of the mid dizzy A12's from the B310 which has bigger wrist pins and fatter conrods at the small end to suit the bigger pins, and the bores are also a touch larger which makes them something like 1237cc. Unless it has A12A stamped in the engine number area?

The oil cap just has a pair of magnetic squares/clamps sitting on it

Posted on: 2018/11/20 6:44
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Re: Datsunbeginner becomes an expert - Vanilla Ice ute build USA
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Nearly every Japanese car has metric bolts and fittings. Mazda use imperial brake and clutch line fittings on some of their cars, like the B1800 ute I had. Massive mind f*** when I tried fitting a Datsun clutch master until I figured it out. Surely if it wasn't right you would have noticed as they would have been very difficult to tighten up.

Posted on: 2018/8/10 13:18
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Re: Datsunbeginner becomes an expert - Vanilla Ice ute build USA
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Coupe bearings are supposedly different from the ute/sedan/wagon. A friend on Facebook discovered that when rebuilding the rear end in his convertible coupe.

Posted on: 2018/7/29 13:18
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Re: A12iR Project (i = single point injection, R = supercharged)
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And as for the idle control, I ditched that idea, I'll probably just run a solenoid or two off some ports on the manifold with some metering holes of different sizes on the open side and drill them to get the idle speeds needed.

Posted on: 2018/4/25 5:15
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Re: A12iR Project (i = single point injection, R = supercharged)
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I was looking at the microsquirt but it seemed very limited in what it could do. You use their Quadspark module to drive the COP's and other individual coil setups.

Posted on: 2018/4/25 5:11
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Re: A12: Accidentally dropped bolt down the distributor hole
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You need a magnetic pickup tool or retractable claw pickup tool and a torch. Shine the torch down the dizzy hole and you'll probably see the bolt you dropped sitting between the block and the cam. Then use your 'skill tester' skills with the pickup tool to retrieve the bolt.

Posted on: 2018/4/22 12:56
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Re: A12iR Project (i = single point injection, R = supercharged)
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Haven't done anything on it in 2 or 3 years.

Now has gilmer pulleys from Kemotorsport in Adelaide.

I bought a new pair of injectors from CAPA Performance which are from the supercharged V6 (L67?) VT commodore, correct cc's with a little headroom according to the online calculator I used. Can't remember if the spray pattern is correct though.

Got an SR CAS modified to take an A-series gear and fit the hole. But after all that got done I realised the shaft has helical grooves in it which keep the oil out of the top section of the sensor. Too much money and messing about to make a new shaft with grooves in it the correct direction for the direction of rotation of the A-series (opposite direction of the SR). Instead I'll gut an A-series dizzy and make a 4 tooth trigger wheel to fit inside with a CAS inside or outside, and make an adapter for the crank to bolt a trigger wheel and the gilmer pulley to.

Posted on: 2018/4/20 1:42
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