Quick query
Turbo Mini Forums

As I have no idea, I thought I would ask.

I currently have some 7cc omega pistons in my avonbar engine... how much is normally charged to dish them out to say.. 18cc or above?

http://www.jolyonway.com

18cc is cheap, because you might as well use a drill

Ah ok. Well in that case I'll start attacking them when I get a suitable drill bit

http://www.jolyonway.com

im not sure if V was serious.....
or was he?
lol

Oh, I know I was joking too.

http://www.jolyonway.com

I very much doubt there will be enough thickness in the crown to get 18cc from a 7cc piston.

WWW.TURBO-MINI.COM

thats a lot to mill off

1293 Turbo mini

Excellent :) That saves me hassle ..
Am afraid engine work is a bit new to me!

http://www.jolyonway.com

Jol, I thought you bought a turbo engine???

Dale

That s a good point . I was getting ahead of myself... I have access to Omegas and I WANT to use them in my avonbar engine... but only if its cost effective.
I need to double check what i have in there currently :/

http://www.jolyonway.com

So do you have the head and an idea of what turbo/boost you want to run.

I have a metro turbo head... t2 turbo.
As for boost... lots?
I haven't thought that far ahead unfortunately, I am just waiting on various bits to arrive so I can get the beast actually onto four wheels and then off to a spray shop!
Get a bit confused about boost :/

http://www.jolyonway.com

How do know you need 18cc pistons when you don't know what CR you need to allow you to run the boost you need to run to make the power you desire?

If that makes sense? lol

In the 13's at last!.. Just

Oh, I was only guessing about 18cc... wasn't a firm number, I was only wondering about the actual cost of doing the final work on the pistons... if that makes sense.
I know I am going about this the wrong way... but its the I stupidly do things
I am not really worrying about engine parts yet, really trying to get her on wheels first !!!

http://www.jolyonway.com

Hi,
Best to do a lot of planning/thinking/asking while it's in the paintshop. The CR, turbo and cam choice really need to be right from the start, otherwise it gets expensive quickly!
Cheers,
Gavin :)

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My Mini build diary

I already have a T2 turbo and Avonbar Phase 2 cam.
That will be going in my 1380 Avonbar engine with metro turbo head.
I just need to work out what the CR will be as it stands.... and if work on the head will be required etc

http://www.jolyonway.com

Decompression plates are for chumps and are a bodge and anyone true to any sort of engineering excellence would laugh at anyone considering such an idea.

I'm not sure.

I agree, if you match the bores with the "holes" you lose squish/damage rings/etc.

If you didn't do that but made the bores the same size as your squish, the squish would not be lost. You could consider it as tacking a bit of thickness on the bottom of your head.

I thought of this idea when I had a full race head which had been overskimmed. I didn't like the idea of having 2 head gaskets, but hey, if it saves you a fortune and more importantly works, that's the deal. I didn't like the idea of having a big thick uncooled chunk on top of the block. It's not that significant really.

I'd go for it, unless you're planning to make an ultimate engine.

I don't like the idea of machining piston dishes....strikes me as a similar bodge.

Anyway, if you measure your chambers/dish/2 HG's calculate your volume and cr. Solve backwards for the chamber size you need. Get the extra cc's and then calculate the thickness of plate you need.

If you need a plate made up cheap, give me a shout.

Bugger off, I'm getting there.