Crankshaft and Flywheel Lightening and balance

Not looking to increase capacity at the moment.
IF I was going to do that would probably just throw a Jag supercharger lump in as you can pick them up for £3000 for the whole car lol.

But thanks for all the inptu. Loads to think about.

Don't bother - go for a LS1 Lump, smaller lighter and can get up to 600BHP, 350, very, very easy to get.

Just before you do anything check out prices for following on LS1 and Jag engines:

Lifters, bearings, block hugger manifolds, cam covers, pistons, cranks.

They are all about 3 times less in price (I am not joking). Also availiblity, is awesome. and LS1 motor is smaller and lighter!!!!

Khryztal said:

Not looking to increase capacity at the moment.
IF I was going to do that would probably just throw a Jag supercharger lump in as you can pick them up for £3000 for the whole car lol.

But thanks for all the inptu. Loads to think about.

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Don't know what your smoking-but you can find much cheaper

all my engines are ballanced crank pulley and flywheel as a matched set rods end to end to 1/2 gram same to the piston crowns
three angle valve seats mild bell of head through to full ported
piper 270I cam standard valve train parts
matched ports on the inlet and exahust manifolds can even full flow the inlet too
on a 3.9 will give 230-265 depending on the heads and inlet

on a manual flywheel it looses 4lbs of weight! on a auto it is just balancing due to it being poorly balanced

mines kicking out 250bhp on and off the road it is all grunt low down and still very tracktable

What sort of cost for that kind of build though?

I'd consider engine work, but everything else is higher priority for me whilst the original motor is still running!

Base engine with new rad water pump and state installed with twelve month warranty is £4,000 +vat then head spec and manifolds push it up add another £1,500 - £2,500 for the fully flowed items

so its a big investment then!

i think i'd be looking at buying another motor and learning as i go along

cheers!

merlin F85 heads are £1300 plus fitting which will give you the biggest increase.

vougese39 said:

all my engines are ballanced crank pulley and flywheel as a matched set rods end to end to 1/2 gram same to the piston crowns
three angle valve seats mild bell of head through to full ported
piper 270I cam standard valve train parts
matched ports on the inlet and exahust manifolds can even full flow the inlet too
on a 3.9 will give 230-265 depending on the heads and inlet

on a manual flywheel it looses 4lbs of weight! on a auto it is just balancing due to it being poorly balanced

mines kicking out 250bhp on and off the road it is all grunt low down and still very tracktable

Click to expand...

260hp sub £500 converted for mine and dyno from mr toyota

As with most things this is a investment having a bespoke engine built and if there was not a Market for them then I would not be building them I average an engine a month and most have the fully rebuilt top hat line red and balanced bottom end which is com an to all my engines then either a standard heads with relapped valves or three angle and ported heads and a piper cams are fitted as standard imuse the 270i in most or the 285 with pocketed pistons too

Most of these are for the p38a customer as what engine and how to swap and fool the electronics are limited so most cost is proportional to that
My full blown engine 4.6 engine with fully ported manifolds and heads and big valves and pocketed pistons and piper 285 cam pumps out 340 bhp in a p38 it is good for over 23 mpg though one customer got got 25 on a run up to Scotland at a constant 70!

In the classic there is a lot more scope for engines no complex electrics to annoy
I would go the lsi route or even a chevy all alloy crate motor but again it is not cheap

vougese39 said:

My full blown engine 4.6 engine with fully ported manifolds and heads and big valves and pocketed pistons and piper 285 cam pumps out 340 bhp in a p38 it is good for over 23 mpg though one customer got got 25 on a run up to Scotland at a constant 70!

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you got a dyno graph for that 340hp - be interesting to compare it to another 4.6 thats putting out 326hp 322lb ft.

spec 4.6 with 4.0L pistons CR 10.8:1 RS 238 mechanical cam. Roller rockers Huffaker inlet with Edelbrock 500. Merlin heads, Maniflow exhaust with 45mm primaries 53mm secondaries and 63mm system


do you do anything to the inlet/throttle body/trumpets?

last time it went to be dyno'd it broke the rollers customer has not let me have it back yet but will doing so for the lro show

vougese39 said:

I would go the lsi route or even a chevy all alloy crate motor but again it is not cheap

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I thought an LS1 is a Chevy:doh: