Hello all

Right i want to know the differance and plus and minus points of these please.

short engine

long engine

2.0 litre

2.5 litre

2.2 stroker kit

thanks mick

 

short engine - is the bottom end only, ie. no heads

long engine - engine with heads included

2.0 litre - illedgidly will rev better than the larger displacement

2.5 litre - will generally produce more torque with a suitable turbo

2.2 stroker kit - best of both worlds but generally more expensive to build

 

so a 2.2 stroker kit is the way to go ?

 

plus

2.1 - spools the turbo earlier, gives more low end torque, more power and costs about the same as a built 2.0

IMHO

dunx

 

so 2.1 better than 2.2?

 

Cheaper... the big budget choices are 2.35 and 2.5.

I fancy a 3.6 twin turbo Tribeca motor.....

dunx

 

A larger bore, shorter stoke engine (2.0, 2.5) should rev better than a stoker

 

o dear its all gone pete tong.... conflicting info ???

 

I can't say for sure because i've never tested it but long stroke engines are usually more torquey and less revy.

Its because they have relatively smaller valves so can't flow as much air. Also the piston has to move further and thus faster per stroke making it less able to rev.

Thats how I understand it anyway

 

anymore info guys

 

hope so its very interesting

 

IMHO

built 2.0 - strong and revvy
built 2.1 - more bottom end torque + still revvy
built 2.35 - best all round track/race motor (?)
built 2.5 - best BIG bhp/torque motor
tickled 2.5 - best road engine (?)

3.6 TT Tribeca lump ? who knows

dunx

 

There is also a 2.65 built bottom end using the standard length rods and a version 9 crank. Still very revvy but shedloads and shedloads of torque and best for bigger laggy turbos that suffer from compressor surge now and again. Bigger turbos won't be quite so laggy trying to fill up 2.65Ltrs.....oh yeah, and no more compressor surge!!

 

Very very interesting guys .... Any examples of these conversions? And who does them?

 

2.65+ conversions are pretty rare but i know of an engine builder doing some development with bigger displacement than the usual 2.5L.

Generally speaking if you want bigger than that i know of some H6 3.0L+ conversions in the USA. That's a lot of weight over the front axle though.

 

2.1 is EngineTuner territory, others can supply too.
2.5 is expensiveif fully built, everybody has one....
2.65+ is astronomically expensive.

All IMHO

dunx

P.S. Scooby 2.5 has a larger bore AND a longer stroke, so breathes o.k., but is more about torque than revs, unless you get a billet crank == £'s.

 

What kills most scoobys young or old is high revs, billet crank or no billet crank. Those that don't realise this and hold those high revs for too long inevitably experience the BIG BANG!!

Most average modified scoobs make peak power way before the redline no matter how much boost you hold to the redline so short shifting is the best way to save your engine and keep it in the sweet spot!!

 

Dont want a 2.5 ... Like the idea of 2.1 or 2.3. Want a clever tidy solution that i can show ie bonnet up or blast down quarter in 11s

 

any more thoughts guys

 

UK or Jap engines?

Jap 2.0 STi's have stronger internals even in WRX guise.
Jap 2.5's fitted to Foggy STi's are pretty good for torque and BHP (I had one ).

 

as above anymore info and thoughts guys.....
More more more

 

info

 

more imput

 

anybody done any of these mods
and? Whats your thoughts?

 

EngineTuner....

 

yes tryed them .... Very good q and a .... And a good comprehensive list of goodies
painful price though

 

No worse than anyone else.

dunx

 

I thought they were very reasonably priced compared with others

 

o no didnt mean they overpriced etc just more than i imagined..... Or dreamed is more like it lol

 

If you want to keep your costs right down DIY!! Then when you've cocked it up because you did something wrong due to lack of experience you can just pay the same again, DIY and **** it up once more.

Stick with an experienced and reputable builder, pay the money first time around and save yourself the grief!! Any builder worth his salt will cast iron guarantee their work and not try to squirm out of said guarantee by putting the blame on you when the engine goes pop shortly afterwards!! It happens so often and this is from so called reputable engine builders with bigger egos than their bank balances. You almost have to threaten them with court action and shaming on Forums before they back down and honour the gurantee. Some of the stories i've heard now from customers beggar belief.

There are probably only 2 or 3 builders in the UK i would even trust with building an engine for me because not only do they really know exactly what they're doing and carry out rebuilds in well lit and very clean and crap free environments, but should anything go wrong during the guarantee period and generally a short time outside the guarantee period, they will just say....bring it down to me and i'll sort it out, no bother!!

Thankfully these builders guarantees are rarely envoked because they did a proper job in the first place!! Choose carefully who you go to!!