Should be sorted ready for DatNats in Easter

nice work simon, im sure you'll be running sub 1.40 at winton in no time!

Post removed acc. Double post

What motorcycle head was used, what's used for cam timeing? and what mod's the the head/block to mate them?

original thread were it was all discussed

have a look through he's photos there all hes goodies.

ROConner, Its still a work in progress, still getting around issues as they arise.

With a project like this its hard to have it fully sorted befor you begin..

Its a cbr 1100 head, custom ARP head studs all block stud holes filled and redrilled and tapped to suit head. water galleries extensivley modded. oil feed to head externaly plumbed, oil drains externally plumbed. Offset bore the block, mod crank.
Reseal entire front of engine. Dry sump oil pump.
Remote water pump feeding through side of block. custom cam sprockets chain and timing case. Sump made from scratch. Crank trigger ign, because there is nothing to drive the distributor anymore. Same with oil pump.. And on... And on......it goes.. Just to save 25kg`s .

Time better spent than doing Sudoku`s i think!!

Some photos of the progress as it happens.

A bit of an update showing radiator(VS V8) and intercooler (EVO 8). the exhaust is a 3" side pipe for better ground clearance.

Dose this hav two set's of injector's?

Do they work at the same time or at different engine speed's?

Look's trick as!

The injectors will be staged, not to sure what rpm to cut back/out the primaries. it will probably take a fair bit of sorting out.

Ive never used a setup like this before but have learned that you will get better throttle responce useing small inboard injectors (close to valve and good atomisation).

and more torque with large outboard injectors, they allow for lower duty cycle and pulse width getting enough fuel in whislt the valve is still open.

It also gives a fraction more time for the fuel to pull heat from the intake air(Vapourization).

Another trick is to keep the duty cycle at around 60% to get the best torque from sequential injenction.

I guess a fully modified pushrod A12 turbo was out of the question in this case or even a modified e15et turbo head

this has got to be the most extreme A series make over in history.
Takes a Mad scientist with Napolean-like Drive.

Hey D,
Just a case of gone too far to turn back!!!

I supose i am enjoying the process. just hope it meets expectations.

After such public exposure i just hope it runs!!!!!????

BTW, i will accept mad!

That little bit of injector theory is interesting, I'd never thought about it like that.

I guess to take it a little further there is probably some more torque to be had by using both sets of injectors through the mid range. For example if you decide that you get the best mix or cleanest burn through injecting fuel for 60% of the available time on each induction stroke then you could shoot for that number at all rpm ranges. So once the small injectors reach %60 duty then you start introducing the large ones.

You could hold the small ones at %60 duty which would result in less fuel as revs rose and compensate with the large injectors up to the point that they are both running at %60 (if the engine ever needs that much fuel?).

I'm sure I've over simplified it but you would think there would be some advantage in using both sets of injectors for some period rather than just switching from one to the other at a single point.

Your spot on Dave there has to be a blending at some point to prevent a hesitation. There was an exellent artical in "race" mag a few issues back on how to go about tuning stagged injectors. It was a cosworth engine in an escort owed by staff at motec. It was set up on their engine dyno and the artical gave some good details. I`ll have to dig it up.
I can remember that swiching from 100% inner to 100% outer was worth a lot of power.

Obviously getting the mixtures spot on is the crittical thing, but if the injector sizing/fuel presure is right you will hopefully end up with a duty cycle of no more than 60% to 65%.

I would love to hear this baby when done - a twin cam A series EFI!

Quote:

There we go, fixed that for you

hehe - exactly cheater_5, even more excited now!

Just a bit of an update.

Pistons and rods finally arrived from the U.S.

This week im making an aluminium torque plate so i can get the block bored/honed.

I ordered big end and main bearings today. still have to get the crank destroked.

The first round of the Vic IPRA season will be at winton April 4/5 Im working on having it going by then. I might be dreaming but i have to set myself a goal.

what sort of power plant are you running? got any engine bay pics?

click on more photos from sikyne link and all (well almost) will be revealved!

Ahhhhhh! so its 'that' engine!

Have you got the motor running yet?

Looking good simon, 'the' motor is much anticipated

Can we get a close up of these bike mirrors? and what exactly are they off?

Looks smick! Well done mate and that motor is looking to be one mean mother!

Jake

Looks tidy, and very well done.

I take it you removed the full amount of metal from around the arches, is it a maximum of 75mm to remain legal?

Do you have any photos of the rear flare?

Thanks!

niiiiiiceee. That engine sure is a marvel. Going to be the tits when its finished for sure.

I`ll post up a mirror close up.
They came from vic motorcycle wreckers as did the cyl head.
I went through their mirror tubs at the wreckers to find them. They were the best looking ones they had. I think they were suzuki units but dont quote me, and they have a slight convex shape(objects are closer than they appear).

With the front guards i only removed 65mm, and the rear have not been cut only tapped out a bit.

AWESOM looking coupe
Great job well done

that is one very tough looking coupe, i love it.
just out of interest why would you go to all the trouble of putting a motorbike head on an a series when you could just use the whole motorcycle engine and gearbox? this would also mean you could use the sequential dog engagement box from the bike too.

Hi Wolki,
The rules state that you must use a block from a datsun/nissan. and the gearbox must have a H pattern shift (non sequential) and no more than five forward gears.

It definatly would have been easier to put the whole bike engine in tho...

well that makes a bit more sense then, thanks for that.

I'm loving the gaurd cut look. Its a bit of a unique way of going about the flare job, and looks really good. Reminds me a bit of WRC carsand they always look tough in tarmac spec. I might try this on my 120Y coupe project...

I can't wait to see how this thing goes once you've had a chance to get it fully sorted!

Hi Harry, Yeah, its a bit different.
I decided the fiberglass flares looked a bit bulky over the little 13" rims. Probably a lot less aero drag aswell..

Edit. and 280 grams lighter than a standard guard..

this is heading to be one awesome coupe !! looking fantastic so far !!!
congratulations

Closeup as requested..

this car is bloody sensational

Thanks guys, Ill post some more engine pics soon.

Ive had to cut the front off the head to allow bigger cam sprockets to fit. so the front of the head and timing case have to be remade.

So is this the car with the A12 block motor cycle head and turbo to boot????

THATS THE ONE!!!!

can't wait to see how well it goes, it somthing a bit different