Mahle gold pistons

Post by **4thgenphil** » Thu Jun 14, 2012 9:57 pm

judderod wrote:Bearings definitely, rods no unless it's turbo. The stock rods are good for any NA setup on the stock crank (not stroked) up to about 8500 RPM, IMHO. Plus replacement rods ain't cheap!

I've never heard of a stock H22 rod that 'just broke' on NA. They go because of oil starvation/spun bearings, detonation, or 10,000+ RPM.

how about h23?

A1ex · Post by **A1ex** » Thu Jun 14, 2012 10:00 pm

PAW knowledge: a7 rods are different to a5 rods.

Definately staying N/A, 11.5:1 pistons would be a waste of time if chose to go boost.

Bearings were done 2k ago

And if I get PAW to do the work they'll get done again if they're needed

Ratty, are they 11.5:1 pistons? If so how much would you want and can I have some dibs (if they're ok)

Post by **4thgenphil** » Thu Jun 14, 2012 10:03 pm

in what way are the a5 rods different? different crank sizes?

A1ex · Post by **A1ex** » Thu Jun 14, 2012 10:07 pm

It's something to do with the connection between the rod & piston.

I asked Rich about it before and he said the a5 rods can be modified to take a7 pistons but it's best to get the a7 rods.

Post by **4thgenphil** » Thu Jun 14, 2012 10:10 pm

so a5's arent floating then!

Post by **RattyMcClelland** » Thu Jun 14, 2012 10:14 pm

A1ex wrote: Ratty, are they 11.5:1 pistons? If so how much would you want and can I have some dibs (if they're ok)

Yes 11.5:1 with a +25 overbore. Got 7k miles on them. We will see if they have survived the blown engine.

and the head.

A1ex · Post by **A1ex** » Thu Jun 14, 2012 10:18 pm

Cheers

Out of interest how much did the overboring cost to fit the pistons?

judderod · Post by **judderod** » Thu Jun 14, 2012 10:19 pm

4thgenphil wrote:how about h23?

Guess it depends how high you rev. The extra stoke increases piston speed per RPM.

RattyMcClelland wrote:We will see if they have survived the blown engine. and the head.

What caused that Ratty

Post by **4thgenphil** » Thu Jun 14, 2012 10:25 pm

judderod wrote:
4thgenphil wrote:how about h23?

Guess it depends how high you rev. The extra stoke increases piston speed per RPM.

8k, maybe 9k

Post by **RattyMcClelland** » Thu Jun 14, 2012 10:25 pm

A1ex wrote: Cheers

Out of interest how much did the overboring cost to fit the pistons?

They are overbore pistonsas the block is susceptible to wear and tear. Even OEM pistons will come in a range of sizes. Previous owner rebuilt the car not me.

judderod wrote: What caused that Ratty

WHere have you been for the past 3 years?

Reground crank and low oil.