Hi

Couple of questions to ask you datsun specific specialists, I am contemplating the idea of super-charging a (a15 engine). First things first I want to retain the push-rod style engine!!!!!!!!!

1. Who do I buy my engine components from? (Forged pistons, conrods, cam & other components required for the build.

2. What compression ratio is enough for 10-15psi? (I would like to run at least 7.5:1) but I

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whoa whoa whoa

all that effort to supercharge, tsk tsk, let me introduce you to a friend of mine, the turbo-charger just jokes but curious why you prefer super?

ill tell you a bit about my motor as it should intrest you:

i have an a15, using fuel injection and twin turbos (maybe not necessary to use twins), but tiny turbos, 1000cc diesel diahatsu models, my car will spool the instant you put your foot on the accelerator, the only time it wont hold boost through a gear change is if i change to 4th at less than 60km/h (i.e. really labouring the motor). point being i feel i am getting supercharger like delivery of power from a turbo, but from a turbo, and it will hold plenty of boost at high revs still

anyways.... i am running 10psi boost with stock engine internals (intercooled), using a delco computer with a factory a-series manifold, i did my conversion as cheap as possible, fitting all the camira sensors and even throttle body up, the only expense was tunning which was plesently only $300
it sounds like you are willing to spend a lot more than i was though so this might not be what your after

hmmm to answer some of your questions.. i have been blowing standard a-series boxes with my setup... and am currently installing the dellow conversion to fit the celica box up, its either do that or get a 63A gearbox which is a facory built a-series box that has l-series internals, so basically should handle your power (but these are rare and pricey)

i think you made need something better than the clutches that are on the market, as i am using what is the a15 heavy duty clutch and i dont think its really suited to my power/torque let alone the power you will achieve

also a h190 diff from a vanette is a good option, easy to modify to fit and doesnt need cutting (disc brake conversion easy also), though lsd's are rare and highly priced for this diff, if you want to spend the cash its probably worth getting something cut

other question is what purpose is the car for anyways? street or race and what type of racing?

also for intrest its possible to get a-series electronic dizzies, so no need to go modifying an e-series one, all i did with mine was weld up the mechanical advance and fit the camira module in place of the a-series one and hey bingo i had spark

hope i didnt come accross as a braging knob about my setup


p.s.
...how are you injecting it?
and note my head is stock a15, unfortunately i have no power figures on it yet as had off-fuel during tune and boost was a little too high so they didnt want to push it ( i run 98 octane in mine also)

A good clutch upgrade is to use a four speed 200b unit. The flywheel will need redrilling to suit.
For the wad of cash you are talking about blowing on this set up, getting everything balanced is a must.

What blower do you plan to use?
If your target is 220, you can forget about the toyota ones. Find something in a lysholm screw unit. They have far greater abadetic effeincy.

Get you CR as low as you can. A positive dispacement supercharger is completely devoid of off boost lag, so there are no problems with unresponsiveness down low.

However, building a supercharged "A" series is quite difficult. This is why there are at least ten turbo'd ones for every supercharged one.

If you really mean to built this project to the extent of which you speak, then lose the air to air intercooler, and build a water to air system, possibley with a cryo spray on the front exchanger.


If you build it, be sure to keep us posted.

1200RC, Get your ride dynod, I'm itching to know what numbers your making.

(1200rallycar)

I want to use the car to run around trough the mountains and I like the sound of a supercharger push-rod engine

what does a pushrod engine sound like compared to a OHC engine, if you can tell thats good, ive never really listened

A push-rod engine sounds deferent to an ohc engine. A push-rod engine sounds much lumpy (to me that is)

Yes that is very true. A pushrod engine sound much more raw and bigger cams sound much lumpier. Example a L-series next to an A-series both with 35/70. L-series you can tell it is a llittle lumpy but doesnt sound anything special. A-series will be sitting there with much more noise and lumpyness sounding very tuff.

FYI, the "blower" noise on most real big drag motors is actually the sound of the toothed belts.

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....pushing air out in between the teeth on the belt and the teeth on the pulleys....