970cc K-Head Turbo Racer
Turbo Mini Forums

Pass time for the more qualified people to take over.

If something is worth doing, it's worth doing half of.

As you are planning on revving the tits out of the thing, pistons and rods will be critical if you wnat them kept inside the block.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

I think to make the power I want its gotta go to 9500-10,000 rpm

Steel rods are a given, its just wether I go bike pistons then rods to suit

Chris

I guess your other option is a quality forged piston (accralite/omega) with some of JK's 6" rods and a fair amount of decking of the block.

If something is worth doing, it's worth doing half of.

Yer, thats the dilemma

Forged Omega / Longer Rods (Relativly easy)

Or

Bike Pistons and longer/customs rods. (Could be hard to make work)

Is the gains from a bike piston worth it?

I can also get hold of cosworth pistons which are pretty good aswell

Chris

If you are building the ultimate motor then bike pistons and custom rods will probably be worth it. If you are on a budget of sorts then omega & long rods.

If something is worth doing, it's worth doing half of.

No budget as such... I need the ultimate motor ... people buy engines from people who win not come second or thrid :)

Bike pistons then.. just got to choose the right ones

Chris

What's the current view on slipper pistons in the A series? Conventional thought was ring seal is going to be a problem at high rpm?

Ok, I can get some forged custom pistons made at £450 + VAT a set

Thats pretty good I think

Anyone fancy helping me draw some up?

Chris

Are you going to market this engine and offer it for sale?

I would have thought there are better ways to build the 'ultimate engine'. By the time you've bought the rare 997 crank, designed and made custom rods and pistons you will have spent a small fortune. There's no way it would be commercially viable against the likes of a S.C. K1100 engine or something from one of the other major engine building companies.

As a one of technical exercise for your own amusement, then yes. As a viable saleable engine, probably not.

The only reason for this engine is to fit in the 1400cc Mod Prod class.

Obviously there are better/cheaper ways to make the power etc but when your limited by rules thats what you gotta do.

The most power ive seen from a Mod Prod 1400cc N/A engine is 172bhp.. the most ive seen from a mod prod 1000cc turbo is 163 (wil h) so anything with more than that will be nice

So maybe market this spec for my class of racing (small amount of people) but i'm not aiming to sell to the masses.

More a technical exercise and general advert

Chris

Edited by 01smartc on 19th Oct, 2010.

if you aim to sell a couple, i (personaly) would look to run as many off the shelf parts as possible,
if you use customs rods ( you need anyway) you can easily accommodate for bike pistons that i would imagine being cheaper then custom forged,
custom cams is where the money should go imo

Yes i moved to the darkside

Instagram @jdm_brett

somthing else to throw into the mix here,

JE pistons do a forged mini piston with a very short deck height, approx 1/4" to work with a 6" rod.

Also with the bike piston are you going to get the right shape crown and the right cpmpression?

Probably not as a bike piston is definitely designed for 4 valves and a centraly located plug.

The advantage being it is light, cheapish and intented to run at high RPM but ON A SHORT STROKE s less piston acceleration.

Is the 970 crank stroke considered short in the bike world, I think not.
For exemple the FAZER FZ1 is 77 x 53,6 mm.
(spinning to 12K thought ...)

Rusty by nature

A proper piston:

http://www.shengineering.co.uk/sh/content/cosworth-pistons

He's got 6" rods as well. Proper forged ones not junk billet:

http://www.shengineering.co.uk/sh/content/saenz-conrods

Edited by Vegard on 19th Oct, 2010.

Ineresting,

looks like the pin could go higher still though.

yep, because saenz already did a 6" rod lol

seriously though its good to see trying new stuff at the cutting edge,

Veg - hope you weren't reffering to my rods there? - ours are forged fro ma billet then cnc machined out of interest

JK

If Carling made Mini engines
it would probably be like this one!

I think will deffo be using JK's rods,

Just trying to decide whether to do custom pistons or not bother?

My main aim is not to sell any of these so dont take that into account.

Its to built the ultimate Mod prod engine

Chris

Probably mean ultimate modprod A-series.

I'm going to have to work hard on mine over the winter to keep ahead of the game it seems! I'm not personally aiming so high with BHP, but I'll have similar torque. Also, even at 150 with 7" hillclimb slicks I'm prety much traction limited in 1st and second.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

You need launch control!

So with the new thinking thread about the GT17.. is that still the best turbo for me?

Chris

i think so,

Yes i moved to the darkside

Instagram @jdm_brett