spud-rs2k123

iTrader: (2)

Is there any difference between them and is there any ways of telling which ones which

Jimmyc

Yep, s1 crank uses different old style oil pump, toothed rotor.
90 spec blocks have cps hole.
Think there maybe some internal differences which may have been mentioned on here before, worth doing a search tbh!

spud-rs2k123

iTrader: (2)

Do they carryva different compression ratio or are they the same

Versus_Creations

iTrader: (1)

S1 engine is better than S2.

russ rs

What's the main diff then jano mate??

Versus_Creations

iTrader: (1)

crankshaft in the bottom end
valves in the top end

essexRSTSouthend

What's so good about the crank compared to the series 2?? seems strange.

Rob_DOHC

iTrader: (4)

Bit of a blanket statement there mate.

Sodium filled exhaust valves, is about the only thing that makes any difference.

Rob,

Versus_Creations

iTrader: (1)

Already answered mate.


Try measuring and see for your self Rob.

muz

I won't weigh in the Series One engine in my workshop that needs a rebuild then

Rob_DOHC

iTrader: (4)

lol, the journal size is listed as being the same.... whats bigger? I've no intention of buying an s1 so im never going to be able to measure one. Its got to be said that bigger isn't necessarily better, and how many cvh cranks break

Think id rather have the new style oil pump and be done with it.

Karlos G

iTrader: (4)

Jano is right there is a difference in the cranks I cant quite remember what it is but it's negligible, sodium filled valves this old will be brittle much like the blocks I wouldnt use either when building a engine.

Jimmyc

Have been thinking about this, do the series one cranks have fillet radius edges (sp & grmr)?

Rob_DOHC

iTrader: (4)

Go on... take some pics Jano, im interested now

essexRSTSouthend

Im guessing they did this,as the series one was designed with rally sport in mind.Wonder why they did'nt bother on the series 2...

muz

Same reason they used a Ghia/XR3i front ARB, base model steering wheel, standard exhaust valves etc. Made the car cheaper to build as nothing needed to be homologated for rally. A Series 2 isn't a patch on a Series One in standard trim unfortunately.

Karlos G

iTrader: (4)

Yes they do but so do a lot of other CVH cranks, from what I've read (and only from what I've read) all MK3 cranks had fillet radius edges as do some of the later CVH cranks.

essexRSTSouthend

Shame hey.Not really missing out on much,apart from the fact of not owning a sexy series one .