Bottom end advice

[20Vcqdriver]

Well I am expecting to start gradually building up a new 3B bottom end for my Cq over the next few months (last part of the car not overhauled) and intend to build it to withstand the proposed 380bhp and subsequent torque. Having spent a lot of time searching for whats best and not getting a 100% answer I thought it would be easier to just ask what are the best components to use for this. I.E. type, spec and company to buy from etc. There seem to be plenty of rod options but sizes seem to vary by a mm or so.
Looking to rebore block and use appropriate oversize pistons if these are available and hope to be still able to use the standard metal ADU headgasket with it. Thanks.

[Error404]

You don't need to over-bore and have new pistons unless the bores are out of spec, you should be fine with a rehone and new rings maybe?
I'm doing the same are you with a 3B bottom end really, and just looking at stronger rods and uprated bearings

[Flat on my back]

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3 thou is the top wear limit then you'll need a re-bore, believe there is a Wossner set that starts at 81mm.

My donor 7A block was measured at 1 thou wear on the worst bore, so get this checked first.

[20Vcqdriver]

3 thou is the top wear limit then you'll need a re-bore, believe there is a Wossner set that starts at 81mm.

My donor 7A block was measured at 1 thou wear on the worst bore, so get this checked first.

So whats the next size piston after the original and what should the bore be machined too to suit? Original bore being 81mm. Will find out what the wear is once the spare block arrives in a few weeks time... Where is the best place to get proven reliable rods in a balanced set.

[Flat on my back]

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In the olden days a standard rebore was a 20 thou increase, any less really didn't increase the capacity much and that was the point.

But now a 10 thou increase can be made cos some piston manufacturers have made these sizes available, Mahle i believe has been mentioned.

Wossner do the set K9201D050, ...100, ...150, ...200, ...250 ranging from 81.5mm to 83.0mm. Take your pick. Personally i'd go for the biggest cc increase i can, therefore 7A block...

From my the 3B engine manual:-

Size Piston Cylinder bore
Standard 80.98 81.01
1st oversize 81.23 81.26
2nd oversize 81.48 81.51

Try 'aronmatic2' for the rods, or again Wossner as they do a set of pistons/rods for £900/1000.

Regards other bits PM Aelred as his prices are always very good.

Anything else Sir...

[Rusty]

What turbo? RS2?

Aronmatic has H section rods going at the m @ a good price.

As for the rest of it, a good balace at BDB and some new shells, bolts and some ARP goodies will easily match expectations.

As above, speak to Aelred for parts if you're unsure.

[20Vcqdriver]

What turbo? RS2?

Aronmatic has H section rods going at the m @ a good price.

Anyone using these rods in there car without issue. Father in law always used to say 'if it's cheap it'll break'

[Rusty]

Aron is, they're supposed to be the same as Scat too, plenty using those, no problems.

[Flat on my back]

.

Well if yu dont want 'cheap'...

get a set of Carillo, Cosworth or Arrow...to name a few!

Oh...and be sat down...

[Jamo]

The main difference is the weight and balancing, their all good if you get a nice set within 1g of each other.

I was going to run Scat then I had Pauters in the diesel block

[Rusty]

When I spoke to Aelred, he was happy to check a set of the H beam rods over before I used them, in case they weren't useable, very helpful chap

[Flat on my back]

The main difference is the weight and balancing, their all good if you get a nice set within 1g of each other.

I was going to run Scat then I had Pauters in the diesel block

And they would have been abit short...

Arrow 129S5 set, for you a cheap £1020...

[20Vcqdriver]

And they would have been abit short...

Arrow 129S5 set, for you a cheap £1020...

Probably don't sell many at that price!

[Jamo]

Probably don't sell many at that price!

Wanna bet

Ti rods cost even more http://www.pauter.com/titanium.htm

[20Vcqdriver]

Ok It's been a while but money shortages and tests on present engine to see what i could get have delayed the start of the spare block overhaul.
Firstly the block I have is a 7A and came with crank but no pistons/rods (not an issue as I'd have to have replaced them anyway), so now need to know what others on here recommend/use for Pistons as been told some produce more piston slap when cold than others , i.e. clearances vary between makes, So recommendations and best places to buy from please. Oh and also been told the type of rings I use also decide the type of hone hatch I get, so advice on this too.
I have a lot to do as this block needs work before I get anywhere near fitting pistons, see pics. Cheers.