Project 600+ Started

Jonny Gav wrote:

hardy 172 wrote:

How would a 20G perform on a 2.35?

Very well, ask MAXBOOST.

In my opinion the 2.5 is a fantastic fast road engine but doesn't last 5 mins as a race engine at 600+hp due to the physics of the engine design, the cylinder walls are far too thin to handle 600+bhp (that's OVER 150hp per cylinder (from 625cc ) for any length of time and eventually split.

Strengtheners can be fitted that will most likely hold together in a road engine but given the high pressures and temperatures of a race engine and its a ticking time bomb, not what you need if you want to be competitive.

The 2.35 is the best of both worlds using a 2.2 CDB (closed deck block) and a 2.5 crank, this gives the largest cc engine available with a very strong block that won't split at high pressures.

If the race boys could get a reliable 2.5cc engine at 600+ believe me they would use it!

All IMHO

2.2 CDB-

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2.5 semi CDB-

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Yip gotta agree the 20g is well suited to the 2.35, very little lag & pulls right through the rev range not taken it past 7900rpm though.

drew wrote:

Yip agree with ya jonny, but people tend to think the 2.35 route is a bit of a slouch, If they'd done there homework they'll find they anything but

The power delivery of the two engines is totally different, the 2.5ltr has more torque wich fools you into thinking its a faster car whereas the 2.35ltr delivers the power smoother and keeps pulling so although it feels slower its actually the quicker car.

The 2.5ltr on a gt35r runs out of puff at around 6000rpm and its quite noticeable whereas on the 2.35ltr the gt35r seems to keep pulling and it may explain why I have hit the limiter a few times


Also on full chat on drag and track the 2.5ltr will see around 100/110 oil temps where as I have never seen over 90 on the 2.35ltr.

do you get the same results from de-stroking a 2.5 as up stroking a 2.2?

stevebt wrote:

drew wrote:

Yip agree with ya jonny, but people tend to think the 2.35 route is a bit of a slouch, If they'd done there homework they'll find they anything but

The power delivery of the two engines is totally different, the 2.5ltr has more torque wich fools you into thinking its a faster car whereas the 2.35ltr delivers the power smoother and keeps pulling so although it feels slower its actually the quicker car.

The 2.5ltr on a gt35r runs out of puff at around 6000rpm and its quite noticeable whereas on the 2.35ltr the gt35r seems to keep pulling and it may explain why I have hit the limiter a few times


Also on full chat on drag and track the 2.5ltr will see around 100/110 oil temps where as I have never seen over 90 on the 2.35ltr.

what power did your 2.5 make when it maxed out a gt35 at 6k

very few liners crack on the subaru engine the ej... it will burst the gasket before that, although i have seen vxrs and other cars split liners but they have always been bored out

am confused here.

just wish a had more time on me hands to do me homework


anyway a can see where jonny is coming from using the 2.2 block due to the strength ov it.

but why use a 2.5 block and take it down to 2.35

and remember we talking about cars what are going t get used on the road more than the track..

well i am sticking with what i would prefer for a high powered "road car"

and 2.5 would be my choice

everyone to there own ehh ???

phils scooby wrote:

very few liners crack on the subaru engine the ej... it will burst the gasket before that, although i have seen vxrs and other cars split liners but they have always been bored out

500bhp+ can crack the cylinder walls at the top of the block on a 2.5 if not strengthened-

I am sure Steve told me today he also had this problem with his old 2.5 block.

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i would like to see one just out of currosity,

finn dnt they use 2.5 linered to 2.1s so they get a thicker wall, liner

wow! at that pic, looks like the det has caused that

phils scooby wrote:

i would like to see one just out of currosity,

finn dnt they use 2.5 linered to 2.1s so they get a thicker wall, liner

a wouldnt no as a was off school that day, when it was liner thickness lesson

also missed the monday when they were teaching about stroker kits


so which a stuck in more at school

neva mind one day am sure if a get stuck am sure a could learn on me dinner hour

which motors hsd the 2.2 motor and were they all cdb's ..i know of 2 motors that are being broke and the engine are relatively cheap

baldy wrote:

which motors hsd the 2.2 motor and were they all cdb's ..i know of 2 motors that are being broke and the engine are relatively cheap

as far as i nar only the 22b had these blocks mate

FINN wrote:

phils scooby wrote:

i would like to see one just out of currosity,

finn dnt they use 2.5 linered to 2.1s so they get a thicker wall, liner

a wouldnt no as a was off school that day, when it was liner thickness lesson

also missed the monday when they were teaching about stroker kits


so which a stuck in more at school

neva mind one day am sure if a get stuck am sure a could learn on me dinner hour

long long time since u were at school bud

FINN wrote:

baldy wrote:

which motors hsd the 2.2 motor and were they all cdb's ..i know of 2 motors that are being broke and the engine are relatively cheap

as far as i nar only the 22b had these blocks mate

1 of them is my old "k"plate legacy and the other is in an impreza

Andy Kindon wrote:

FINN wrote:

phils scooby wrote:

i would like to see one just out of currosity,

finn dnt they use 2.5 linered to 2.1s so they get a thicker wall, liner

a wouldnt no as a was off school that day, when it was liner thickness lesson

also missed the monday when they were teaching about stroker kits


so which a stuck in more at school

neva mind one day am sure if a get stuck am sure a could learn on me dinner hour

long long time since u were at school bud

well rumour has it u were studying gardening the last few school years, and u spent majority ov ya time in the greenhouse ??

rofl, ten steak steve is the gardener

Andy Kindon wrote:

rofl, ten steak steve is the gardener

dont think he a gardener anymore, someone told me he now a milkman?

meant to ask him yesterday.

baldy wrote:

FINN wrote:

baldy wrote:

which motors hsd the 2.2 motor and were they all cdb's ..i know of 2 motors that are being broke and the engine are relatively cheap

as far as i nar only the 22b had these blocks mate

1 of them is my old "k"plate legacy and the other is in an impreza

legercy could have the 2.2 open deck block. but no imprezas

the vectra had a 2.2 but dint nar if it was cdb lol

Here are some more pictures of the rebuild:-

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Heads O Ringed

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Porting to inlet on Head

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Engine Nearly all together

Well got the car back from Andy K and its so smooth, need to get the miles on now, so I can get it remapped again with the new changes made. Roll on 1000 miles.

Engine refitted back into car.

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Well I have had a nice little drive to Swindon to see Bob Rawle to get the car mapped, with all the new changes. wow wow wow wow

Bob spent 4 hours changing alll the settings with Race Rom and has had to put in a shit load more fuel at the top end which you can really feel.

I am hoping to get the car on the rollers next week before NBO, to see what improvement the changes have made.

pleased its sorted iddy it was quick before mate

will that turbo run 600

looking good

my heads are getting the rings done aswel

phils scooby wrote:

will that turbo run 600

looking good

my heads are getting the rings done aswel

Phil, it will not do 600 on normal fuel, but will defo with a 10% mix.

Its running 93% duty on 800cc injectors, which I am told is about 585bhp and that is on tescos best.

I am looking at getting the wheel changed to a billet type which then might release another 30hp or so as that is whats happening with other turbos that are getting modified. So you never know it might make it on normal fuel.