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   All Posts (jmac)


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Re: WTB- a15 crank
No life (a.k.a. DattoMaster)
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Any chance you'd have an a14 crank you'd trade for it? If so I'd be interested, if not, I've only got complete a15 blocks (might need an a14 crank for a rally car project hence the offer)

Posted on: 2016/4/17 7:55
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Re: Toyota T-50 3T - Will it hold the power??
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I'm just going to put this out there. When I was in my teens, I used to play with toranas a lot. they had the holden banjo diff which is considered a weak point to say the least. You could literally snap an axle (I realise you are talking about a gearbox, but the point is the same) with a stock 173 and a manual gearbox, by jumping off the clutch quickly enough often enough. In that guise the cars would be lucky to run a high 16, probably mid 17 second 1/4mile, so not too quick in that form to say the least.

There was a guy in SA called Rob Flego (I hope I'm remembering the name right) who ran a modded 186 with nitrous with an auto box in the same car. He stuck with the banjo diff, and with being able to launch with an auto, and do so smoothly, it wasn't until he was running into the low 10s/high 9s that he was constantly breaking the things.

My point being there's torque, there's the weight of the vehicle, and there's also 'shock loading'. You're putting the box into a car lighter than its original fitment, which is a plus. The torque will be higher than any NA a series almost without question. BUT, the 'big' deal here is you can control the shock loading. What the box will tolerate in steadily fed in force versus jumping off teh clutch is considerable, and that goes for any gearbox.

If you concentrate (and just to be clear I'm not accusing you of driving badly or anything, just talking about what it is that breaks things) on smooth launches and slipping the clutch a little more off the line, YES, you will go through clutches at a higher rate, but they are consumables and replaceable. Do _that_ and you'll get the box to last a decent amount of time.

People were putting these boxes behind holden 6s in toranas (more torque and heavier car) and they did survive ok-ish if treated properly. THen the supra boxes came along and everyone gravitated toward them. Don't get me wrong people were still breaking them, but it was mostly down to driving style.

Ride the clutch just a little more off the line (which if done right will actually let you build up boost quicker too) and soften the upshifts just a little, no full throttle 'flat shifts' and lift off the clutch a fraction slower after the upshift and you'll get a lot more life out of it.

Posted on: 2016/4/16 4:36
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Re: what Tyres for 13x6 rims
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are you looking for recommendations for sizes appropriate to that size rim and the car in general or recommendations on specific tyre brands/models and how well they grip or both (may help with responses)

Posted on: 2016/4/7 11:30
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Re: datsun 1200 coupe tail light gaskets/seals
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Might be a silly question but that's $55 for a pair/set yes? not per side?

Also what are they made out of and do you have any photos of them showing how they line up and stuff (I reckon they'll sell easier with this info/pic stuff provided at a guess!).

Posted on: 2016/4/6 8:36
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Re: Bike Carbies
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very general rule of thumb, look for carbs off a bike whose engine has similar power output to what you are chasing (or slightly less). So if it's a stock a15 (for example) maybe look for a bike with 60bhp or so. For a very serious a15, you'd want carbs from a bike engine making 150bhp or more depending on just how closet to full race the combination is.

Posted on: 2016/4/4 10:57
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Re: datsun 1200 coupe tail light gaskets/seals
No life (a.k.a. DattoMaster)
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whereabouts are you located?

Posted on: 2016/4/3 13:44
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Re: Round Ports for the win!
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The problem is that intake valve temp isn't a huge factor, exhaust valve temp is, because it's the one that runs much hotter relatively, which is why you need different material for said exhaust valves and partly why special hardened seats were initially fitted to exhausts (in cast iron heads, obviously alloy heads had seats for both from the getgo)

What's the engine combination based on - high compression NA engine or high boost turbo/supercharged or something else? If it's boosted, it becomes somewhat moot since you'd need a bigger chamber anyway (still within the basic shape/style already mentioned) to get the comp ratio down where you need it. Exhaust valve seat width would ideally be selected based on it too - turbo requiring the widest (adn it's all relative mind you) contact patch, followed by supercharged then NA. If you're running e85 it has a decent cooling effect on the charge in general and this can be a factor too (though it's often as not offset by the fact that it enables more boost to be run and indeed more generally therefore is run)

Posted on: 2016/4/3 13:43
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Re: Round Ports for the win!
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yes and no. THe intake valve position 'can' be an advantage, but the problem then becomes that the chamber is all in the piston which can lead to odd piston designs/extra weight of a moving part vs a stationary one. Very generally the bathtub/wedge (some combination of those two) head tends to be the one to go for for 2 valve heads when it's all said and done.

there's probably a few diesels that have heads like that (obviously not pre-chamber ones) if for no other reason than to get at the required static comp ratios necessary for a diesel to work in the first place.

Posted on: 2016/4/2 15:18
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Re: Your first vehicle
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ddgonzal - the holden 6 is basically like a 'mini-me' design of the chevy inline 6 - including the siamese intake ports with the head bolt going through the centre of them and obstructing flow.

My first car - LC torana - can't buy it back, a friend crashed it and destroyed it, but he got out without a scratch. I look back and sometimes wish the reverse had happened! I'd happily have any of the LC/LJ toranas I had back. when I had them (late 80s and early 90s) they could be had relatively affordably. Now finding one that is rust free enough to even consider a resto on is a major hurdle, and the prices are nuts.

Posted on: 2016/4/2 12:24
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Re: Datsun 1200 Ute Project + Parts For Sale EOI
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no worries, if that time comes, pm me, I'll grab it even if I've found another one in the mean time, they seem so hard to get I want to have a spare or two!

Posted on: 2016/4/2 11:42
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