Inlet Manifold...Where?

Biggest mistake people make is to try and re invent the wheel.

You would struggle to skim the head enough to compensate for the dish, and end up with anything above 10:1

Plus you would have brought the valves 2-3mm closer to the pistons thus requiring cut-outs (because your gonna use a performance cam right).....so you may as well use decent pistons from day one.

Plus the dish is a device to create a slower burn for emission's purposes.

Oh and you would have screwed up a perfectly good head will end up with an underperforming mongrel
 
Think changing pistons will be easier than changing rods an machining piston.

Appreciate the help and advice

Without having to go out in the garage.......does the engine have to be lifted out or can pistons be removed in situ?
 
Guys can the pistons be changed without removing the engine?
Click to expand...

Assume a rebore - engine out, full strip down, new where possible. Overbore will help compression too...

Doing a standard piston / ring swap with the engine in may be possible, but it is a dirty and uncomfortable way of doing an important job. Do it right first time - plan your engine requirement and build a strong and reliable, cleanly assembled engine...
 
Well I'm assuming it won't need boring as its only done 7000 miles.

But good news if pistons will come out from sump off

Where is best to buy pistons and what exactly am I needing?
 
New pistons means new rings. New rings means Honing the bores.

Much easier to drop the lump out Imo. Real easy job on a Zed 2 hours tops.
 
Update on this

I'm currently porting the head. Great fun, matching it to the template John Mangoletsi thoughtfully supplied with the manifold

With my special pistons and forged rods what CR should I be aiming for and what do you estimate will need to come off my head to achieve this?
 
Have the pistons been made to the same spec as standard ones? or have they been altered to achieve a higher CR.
 
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