Gutted cracked block AGAIN :-(

[2barGee]

Well it looks like I've cracked my block again!!! Totally gutted as the car was perfectly set up for quick road and track work (420bhp)!!

I'm now unsure what do as this is the 2nd time I've cracked a block!!! This time I was on 86mm pistons & I kept boost below 1.6bar.

I don't have the money to just rebuild the engine and try again and I just think that I'd crack another block anyway soooooo

Options are
1. Sleeve my block and down grade back to a standard turbo set up (fingers crossed it would be reliable on track).
2. Sell all my mods and drop a standard rev3 turbo lump in.
3. Sell all engine bits and drop a na or v6 engine in for a change.

What do you guys think??
I'm going 2 keep it as I love the mr2 and it's great on track I'm just not sure which way 2 do things at the moment???

Cheers dan

[3S Service Centre]

bad luck mate.

[2barGee]

bad luck mate.

Have u got any lumps hanging around mate

[3S Service Centre]

got loads what u looking for?

[2barGee]

I'll send u a pm mate. Cheers

[JJ]

Sleeve it ! In reality you just need to do the two middle bores !

The thickness checks I've done with several blocks indicates an inherited weakness in the design of these blocks ( irrespective of variation ) although I've not checked a rev 5 block !

The sleeving will irradicate the issue, the properties of the cast iron sleeves yield an increase in ductility/hardness per mm compared to the cast iron block to withstand the higher boosting pressures.

So although the overall thickness of the cylinder Walls may not be increased, the resistance to cracking is dramatically improved !

Limitations unknown, I push mine to 1.8 bar and its holding together ! Sort the cooling and ramp up my fuelling when I have time and I'll try 2 bar plus daily on a high compression setup !

[2barGee]

Sleeve it ! In reality you just need to do the two middle bores !

The thickness checks I've done with several blocks indicates an inherited weakness in the design of these blocks ( irrespective of variation ) although I've not checked a rev 5 block !

The sleeving will irradicate the issue, the properties of the cast iron sleeves yield an increase in ductility/hardness per mm compared to the cast iron block to withstand the higher boosting pressures.

So although the overall thickness of the cylinder Walls may not be increased, the resistance to cracking is dramatically improved !

Limitations unknown, I push mine to 1.8 bar and its holding together ! Sort the cooling and ramp up my fuelling when I have time and I'll try 2 bar plus daily on a high compression setup !

I might sleeve it mate, im just looking at all options really. I'm guessing id need new rings?? Mins have done about 4k??

[greeny]

Where did you crack it lad?

In all honesty, id go late 5s block now and not worry about it again.

[JJ]

I might sleeve it mate, im just looking at all options really. I'm guessing id need new rings?? Mins have done about 4k??

Rings always if you've swapped blocks !

id go late 5s block now and not worry about it again.

Where can we buy these greeny ??! Look for a 2000 Camry 2.2 ?

Theres a 95 model "whole car" for £394......

[mark239]

Sleeve it ! In reality you just need to do the two middle bores !

The thickness checks I've done with several blocks indicates an inherited weakness in the design of these blocks ( irrespective of variation ) although I've not checked a rev 5 block !

The sleeving will irradicate the issue, the properties of the cast iron sleeves yield an increase in ductility/hardness per mm compared to the cast iron block to withstand the higher boosting pressures.

So although the overall thickness of the cylinder Walls may not be increased, the resistance to cracking is dramatically improved !

Limitations unknown, I push mine to 1.8 bar and its holding together ! Sort the cooling and ramp up my fuelling when I have time and I'll try 2 bar plus daily on a high compression setup !

+1

I cracked my block, sleeved it and its now fine up to 2 bar on a GT35

I don't drive it much but it does get dogs abuse when I do.

[greeny]

I might sleeve it mate, im just looking at all options really. I'm guessing id need new rings?? Mins have done about 4k??

Rings always if you've swapped blocks !

id go late 5s block now and not worry about it again.

Where can we buy these greeny ??! Look for a 2000 Camry 2.2 ?

Theres a 95 model "whole car" for £394......

I managed to find one in the UK, but they were never sold here as far as i know, The US is swamped with them, but as always its the cost of getting one over, You wouldnt think about building a 3s based engine once you see one

Only downside is the lack of oil squirters, but the oilways there as the same on the 3s, just need a spot face cutter and drill and tap for them. I personally didnt bother, but would if i were to build a daily driver/track car.

You want the 1996+ engine really as it has the stronger external casting, as far as i know.

[mr2nut123]

Well it looks like I've cracked my block again!!! Totally gutted as the car was perfectly set up for quick road and track work (420bhp)!!

I'm now unsure what do as this is the 2nd time I've cracked a block!!! This time I was on 86mm pistons & I kept boost below 1.6bar.

I don't have the money to just rebuild the engine and try again and I just think that I'd crack another block anyway soooooo

Options are
1. Sleeve my block and down grade back to a standard turbo set up (fingers crossed it would be reliable on track).
2. Sell all my mods and drop a standard rev3 turbo lump in.
3. Sell all engine bits and drop a na or v6 engine in for a change.

What do you guys think??
I'm going 2 keep it as I love the mr2 and it's great on track I'm just not sure which way 2 do things at the moment???

Cheers dan

Gutted Dan. Really feel for ya buddy. One thing I will say is...keep her below 1.4bar and around 380bhp and she will be fine. Anything over 400bhp is asking for trouble, especially in even our summers. I get bad knock at 1.5bar but it's fine at 1.4bar. It doesn't seem much, but it really is a huge difference. JJ's rule of thumb (after experience of engine failure!) of 1.4bar seems pretty accurate.

Do you have 264 cams already? If not, I would highly recommend them as you pick up ~25hp at same boost levels which helps keep pressures down.

Hope all goes well with the rebuild

[2barGee]

Where did you crack it lad?

In all honesty, id go late 5s block now and not worry about it again.

Not 2 sure yet mate as the engine is still in the car. But it over heats once you pull up after giving it a boot full or on a longish motorway drive.

I was on a stock rev3 head.

I thought 1.5 bar was ok and anything 1.6+ was the problem. It's luck of the draw I guess as people on here have run 2 bar + and never cracked......

[JJ]

I thought 1.5 bar was ok and anything 1.6+ was the problem. It's luck of the draw I guess as people on here have run 2 bar + and never cracked......

I cracked one of my blocks at 1.3 bar ! Go figure !! That was with 86.50mm's in though... The last one I cracked was running 1.6 bar daily which was fine.. 86.00mm pistons... and for those awkward porsche moments... 2.0bar... which kinda finished it off !!

Only downside is the lack of oil squirters

Just run it richer ! Funny.. some of the US Drag Supras run NA blocks that dont have oil squirters either......

[2barGee]

I thought 1.5 bar was ok and anything 1.6+ was the problem. It's luck of the draw I guess as people on here have run 2 bar + and never cracked......

I cracked one of my blocks at 1.3 bar ! Go figure !! That was with 86.50mm's in though... The last one I cracked was running 1.6 bar daily which was fine.. 86.00mm pistons... and for those awkward porsche moments... 2.0bar... which kinda finished it off !!

Only downside is the lack of oil squirters

Just run it richer ! Funny.. some of the US Drag Supras run NA blocks that dont have oil squirters either......

No more porsche racing for me

I've 95% decided what im going to do....................

sell my turbo set up, injectors and power fc.

This should pay for my new stock engine, no more power power power stuff.

Then im going to fully the stip the car for track days etc!!

[Chris]

I still believe it's more to do with mapping then the block itself. My old car ran a early Rev 3 block at 2.5 bar for years. No probs.

Andy F's car ran 86.5mm pistons, 2.3bar for years no problems.

Neither of us have ever split a block. Both cars ran stock cams. So uprated jobbies make no odds to cylinder pressures. Prob increase them as no one seems to get them set up correctly. (not you JJ )

The things in common on mine and Andy's old car was, same mapper and excellent charge temps. And YVS Performance

If you want the block sleaving. I'll see if can get it done for you. I sorted JJ's out. His is the test bed

[2barGee]

I still believe it's more to do with mapping then the block itself. My old car ran a early Rev 3 block at 2.5 bar for years. No probs.

Andy F's car ran 86.5mm pistons, 2.3bar for years no problems.

Neither of us have ever split a block. Both cars ran stock cams. So uprated jobbies make no odds to cylinder pressures. Prob increase them as no one seems to get them set up correctly. (not you JJ )

The things in common on mine and Andy's old car was, same mapper and excellent charge temps. And YVS Performance

If you want the block sleaving. I'll see if can get it done for you. I sorted JJ's out. His is the test bed

hi chris hows things??

My charge temps have always been well good with the huge charge cooler ive been running, and im on a stock rev3 head as well with just arps holding it together.

The map im running the fueling was bang on and the knock levels never went over the set level on the power fc??

I would go sleeved but as ill be going back to a ct20b i might as well just get a stock engine. The last block i cracked was on 87mm pistons

[Chris]

Hi Bud,

Things are getting better at my end now Been a rough ride. Did my first day back at work yesturday. Off again today though.

You might be suprised how much it costs to go back to stock....Cost Andy a fortune! Lots of silly little things you forget about add up quick! You might find it cheaper to sleave the old girl. Work out the cost before selling your goodies!

87mm, playing with fire there like.

[Steve Horrocks]

As Chris, im on stock block (at 86.25 with forgies) stock had & cams and running 1.9bar. It's been built for a while now & totally fine. (and for sale, hint hint!) lol

Don't give up dude!

[2barGee]

Hi Bud,

Things are getting better at my end now Been a rough ride. Did my first day back at work yesturday. Off again today though.

You might be suprised how much it costs to go back to stock....Cost Andy a fortune! Lots of silly little things you forget about add up quick! You might find it cheaper to sleave the old girl. Work out the cost before selling your goodies!

87mm, playing with fire there like.

Ive found a full rev3 turbo engine so i just want otcheck it over first but it should hopefully be a straight swap.........

glad stuff is sorting its self out fella.