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Re: A14/15 turbo~280hp, bore question
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Thatīs the right spirit, I have played with the A-engine for over 15years and only broken some pistons and bent some valves.... probably because I havenīt had enough power! No itīs time to test the limits....

The worst thing that could happen is this....

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Quote:

Lemonhead wrote:
Thanks Marcus, that is good info on cutting up a block, well done.

I have done 79mm blocks before without a problem, admittedly not boosted.

In my opinion, all of your turbo boost pressure will not be putting high expansion (compression) pressure on the sidewalls of your bore until I'm guessing about the last 25mm (I'm guessin here - ok) of your compression stroke.

All of your ignition and power takes place around here, i.e 25mm down the bore to TDC depending on your set up.

This is a pretty strong area on the A-series block.

So, to sum up my point, go for the 79mm bore, what's the worst that can happen, split a bore? I've never heard of one splitting at the top due to high compression, they have always been mid stroke due to very thin sidewalls, and hey what if you do split one...throw it out and start again.

Nothing ventured nothing gained.

Posted on: 2010/10/4 18:34
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Re: A14/15 turbo~280hp, bore question
No life (a.k.a. DattoMaster)
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Quote:


The worst thing that could happen is this....


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That is one busted piston. Thats a trophy for sure. Beats my pathetic bent push rod...

Posted on: 2010/10/5 0:22
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Re: A14/15 turbo~280hp, bore question
No life (a.k.a. DattoMaster)
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Just to think that if you damage your bores on an a14 or 15 block
you can still wet sleeve it if the damage is not beyond the bores
and through the block. Looks like a copper head gasket is the only
solution for an 83-85mm setup.

Posted on: 2010/10/7 1:52
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Re: A14/15 turbo~280hp, bore question
No life (a.k.a. DattoMaster)
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bump

Marcus if you can cut the block at the water cavity base Itll be awesome as I have the
liner from the peugeot and if all lines up then I can get new Mazda 1993-96 626 which
have 19mm pins like the a14/15 rods or late a12a and 29.90 compression height.
Im only aiming for a naturally aspirated 1796cc combo using 83.5mm pistons as 1818cc
for 84mm pistons will take liners to no further room for future boring.
Id rather use oversize ca18de pistons but pin size is 20mm and mazda pistons have 19mm
and are made for the 92mm factory stroke so should be good enough for 82mm stroke.
I realised that Orger engines will need an A14/5 engine to machine rather than an A12.

Posted on: 2010/10/11 0:03

Edited by D on 2010/10/11 0:24:26
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Re: A14/15 turbo~280hp, bore question
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I took the engine apart tonight so I can do some more cutting in the block without damaging the crank and the camshaft, I will try to cut the block at the water cavity base as you like!

Marcus

Posted on: 2010/10/12 18:13
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I am building a mean Datsun E10 racer , a15 turbocharged engine, aiming for 280hp....
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Re: A14/15 turbo~280hp, bore question
No life (a.k.a. DattoMaster)
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great will be awesome to know if the pug liners will be the cheap
upgrade Im hoping it to be.

Posted on: 2010/10/15 5:01
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Re: A14/15 turbo~280hp, bore question
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Hello fellows, snowy greetings from Finland!

Sorry about the delay, the winter is approching here in Finland so there has been some preparation for that! Yesterday I finally got time to do some more surgery on my spareengine! I am still very impressed of the cylinderwall thickness! It seems like the cylinders are very similar, thereīs not much variations in cylinderwall thickness between each cylinder...

On saturday morning when I woke up my frontyard looked like this.....

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Posted on: 2010/10/26 19:19
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Re: A14/15 turbo~280hp, bore question
No life (a.k.a. DattoMaster)
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Absolutely Amazing shots Marcus, Im sure you are the first person in history
to do a deep space exploration on the A series and post their findings.
Captain Piccard would be most pleased on your contribution to mankind as
is the rest of the A series afficionados.
Thank you Marcus from all the Datsun1200.com freaks.

Such a beautiful and pure place you live in which is such a contrast to the
evil doings going on inside your workshop!

Could you post one final pic of the other side of the block
(like in the second pic) where the pushrod side is revelead?
Its seems there is little room to go more than 2mm overbore judging by the webbing
on the 1/2 and 3/4 siamesed webbing. Also the pushrod side could present probs
for the full wet sleeve setup as there is little room for the sleeve once large bores
are machined, meaning some severe offset boring needs to be moved towards the
inlet/exhaust non pushrod side of the block.

Posted on: 2010/10/27 0:07

Edited by D on 2010/10/27 2:32:56
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Re: A14/15 turbo~280hp, bore question
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Thank you fore those kind words, I am more than happy if my pictures can help other Datsunfreaks around the world!

Here are som more pictures.....

Finland is for sure a beautiful and pure place to live in but sometimes I wish the summerseason would last a bit longer!?

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Quote:

D wrote:
Absolutely Amazing shots Marcus, Im sure you are the first person in history
to do a deep space exploration on the A series and post their findings.
Captain Piccard would be most pleased on your contribution to mankind as
is the rest of the A series afficionados.
Thank you Marcus from all the Datsun1200.com freaks.

Such a beautiful and pure place you live in which is such a contrast to the
evil doings going on inside your workshop!

Could you post one final pic of the other side of the block
(like in the second pic) where the pushrod side is revelead?
Its seems there is little room to go more than 2mm overbore judging by the webbing
on the 1/2 and 3/4 siamesed webbing. Also the pushrod side could present probs
for the full wet sleeve setup as there is little room for the sleeve once large bores
are machined, meaning some severe offset boring needs to be moved towards the
inlet/exhaust non pushrod side of the block.

Posted on: 2010/10/27 19:31
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I am building a mean Datsun E10 racer , a15 turbocharged engine, aiming for 280hp....
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Re: A14/15 turbo~280hp, bore question
No life (a.k.a. DattoMaster)
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The threads move so quick its hard to track this one back again.
Big Tah from me Marcus you have made my day, it looks like Ill be
able to offset grind the my crank so the TDC occurs at 5 degree to
the right which will help with the in/ex biased offset.
I hope the block doesnt crack apart once and if the 83.5mm bore
liners fit. Maybe I will need to make a bearing brace or get Clyons8
to do a lasercut of one if people are interested in a group buy and
use either ca18de main bolts or slightly longer arp ones.

i hear what you are saying about summer Marcus but here in Melbourne
the summers can reach 47 degrees which are only good for baking or
frying eggs on your car bonnet.

Posted on: 2010/10/28 5:40
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