Whats the benefit of a twinscroll sump?

 

Ej22t closed deck block (customer supplied)
EJ257 Crankshaft (heat treated)
Rear thrust conversion
14mm headstud threads
Rebored and faces skimmed
RCM 97.50mm stroker pistons
Ej257 heat treated crank
RCM/Arrow H beam rods
Acl race bearings
11mm RCM oilpump
ASP 14mm headstud kit
Block bolts sets
Block seal set
Crank seals
RCM ej22 MLS headgaskets
RCM waterpump
Cosworth cambelt kit
RCM baffled sump
Supertech valve set
Heads skimmed, valve seat re-cut, clearances adjusted

£750 extra if I go for the billet 81mm crank I think its made by Maxspeeding?
£1500 extra if I got for a 79mm Billet crank made by Arrow/RCM

 

Arn't they the £150 chimichonga turbo sellers?

£1500 for a crank sounds mega expensive though.

Can't you get nitrided for 1/2 that?

 

Thats what heat treating is...

 

Put the 1500 towards other stuff

 

What heads you gonna use?

 

Heat treated is better than nitrided

 

Sump design is narrower stops the oil sloshing about as much, hence less chance of oil starvation

 

Heat treated crank is not the same as nitrided. All new impreza cranks are now heat treated and not nitride cranks.

 

This was my full engine spec

• EJ22T block
• EJ257 79mm nitrided crank
• Wiseco stroker pistons
• Crower stroker rods
• ACL main and big end bearings
• Cosworth 12mm high flow oil pump
• 14mm head stud conversion
• avcs heads ported and knife edge polished
• 1mm oversize Cosworth Inlet and Exhaust valves
• supertech titanium retainers
• supertech double valve springs
• supertech valve seats
• 272 inlet and exhaust cams
• Adjustable exhaust cam pulleys
• Kevlar timing belt
• cosworth billet timing belt guide
• Cosworth high flow inlet manifold

Billet 35R, 2.1 bar 15% meth

 

The standard dual avcs spec c heads that are on the car now.

Agh ok

I know it's max something, they are supposed to be reputable and create pistons and rods for other brands.

So the big question do I go for the 2.35 or 2.42?

 

Banny how often do you drive this motor and what clutch did you have to go for? Whats it like to drive?

 

Do keep up, at the back.

 

Know anyone who has actually used them yourself? Soon as i see £150 turbos i get ebay special chinese nock off shudders.

But as said nitrided will do the job (as banny shows), a known quantity and cheaper.

 

not strictly true as the EJ20 STi cranks are still manufactured in "nitrided" form.......
only the EJ257 crank is no longer available nitrided (ceased approx 4-5yrs ago!!) and is supplied these days in "heat treated" form

 

And what is nitriding if it isnt heat treatment?! 🤔

 

I got a ACT 6 Puk paddle clutch from Alyn. For a paddle clutch it drives really well.

Your welcome to come have a feel of it in mine. Don't think your to far from me

Ryan

 

MaxSpeeding.

 

Might be a good Idea You free this weekend

 

Not got the car at home this weekend. It's up at a mates garage. Hoping to have it back by end of next week

 

Drop us a PM when your available I guess it would be a good idea to see what i'll begetting

 

Will do pal.

Car isn't mapped yet but can take it round the block off boost and get a feel for it

Ryan

 

Thanks Bud

 

Well the car is long since dead (engine is going strong in a mk1 escort ran by CAMS) I drove it for a year as a daily to work and back 14 miles round trip and was a pleasure to drive and no issues in traffic.

I ran an exedy twin plate clutch and I preferred the pedal feel to the ACT I had in the type r I just sold but then again the twin is almost double the price.

 

it is but totally different process to "std" heat treatment.................

to better explain
the EJ20 STi cranks are still manufactured in "nitrided" form and have a matt BLACK appearance.......

the EJ257 crank is no longer available in nitrided (ceased approx 4-5yrs ago!!) and is supplied these days in a std "heat treated" form and have a mainly steel finish with heat / rainbow marks

 

Perfect, thanks Alyn.So although both are a "heat treatement" they are actually different.

Are nitrided the ones to have then?

 

the nitrided cranks are arguably "tougher" but we have found the newer 2.5 H/T's to be very effective also

 

What Impreza you driving now?

 

Diesel Golf.........

 

£150 sounds dear! My £125 td0520g is performing excellently, recently pushed my newage into the low 12's.