10 replies to this topic

[yaaan]

So, I've bought a used engine off Lee with the intention of building this up and once it's done I'll swap it out for the one currently in place to hopefully make a bit more from my ITBs. The recent Wiseco pistonrs/eagle rods thread has made me think that I might be better off getting hold of some z22yh parts rather than shelling out big bucks for shiny parts from the States, in which case I have a couple of questions. 1) If I get hold of some z22yh pistons/rods do they drop straight in or do I need to do any work to the block? Do I need to rebore the cylinders? Vocky pointed out that the bores will probably be worn so would probably need doing anyway. If so, will the pistons then be too small or can this difference be made up with new pistons rings? I presume that the rods will fit the se crankshaft ok or will that need replacing as well? I presume that these can be bought new but I guess used makes the most sense if they're in good condition. Apart from ebay are there any recommended sources of parts either new or used that are likely to have them in stock or get hold of them on a regular basis? 2) Is there any need to replace valves, springs etc? Currently I have stage 2 comp cams but am considering putting in stage 3s so don't know if that will make any difference. I've got 4-1 manifold, 2.5" system, lightened flywheel on order and a balancer delete kit in the pipeline so hopefully by the time this is all done I'll be happy if I'm hitting around 220bhp

[Kev S]

What bhp are you at now, I would have thought you would be near 220bhp or is that not realistic? I may be interested in your stage 2 cams if you sell them

[vocky]

If you can find a z22se block with no bore wear then a set of z22yh pistons and rods can simply be fitted, the z22se crank can be retained so the z22se ecu can be used. My advice would be to get a low mileage z22yh and either use the entire bottom end (webcon ecu) or swap the crank to a z22se and then the z22se ecu can be retained. It certainly seems to be the case that to go past 200bhp you need 11:1CR on the z22se engine. If using the webcon throttle bodies with the 7800rpm limiter it is best to use double valve springs, if you are going to use stage 2 cams then standard valves should be okay. For stage 3 cams I would advise fitting the GM Racing +0.5mm valves and a decent ported head. Webcon have a great Phase 2 map which uses 11:1 CR and stage 2 cams, this should give between 215 and 225 bhp. The stage 3 cams don't currrently have a Webcon map available, even though my old phase 3 was mapped by them, this is because it had to have bigger injectors fitted due to the 4-2-1 looped exhaust - so it will not be suitable for other engines. Phase 4 map will be available next year

[yaaan]

If you can find a z22se block with no bore wear then a set of z22yh pistons and rods can simply be fitted, the z22se crank can be retained so the z22se ecu can be used.

My advice would be to get a low mileage z22yh and either use the entire bottom end (webcon ecu) or swap the crank to a z22se and then the z22se ecu can be retained.

It certainly seems to be the case that to go past 200bhp you need 11:1CR on the z22se engine.

If using the webcon throttle bodies with the 7800rpm limiter it is best to use double valve springs, if you are going to use stage 2 cams then standard valves should be okay. For stage 3 cams I would advise fitting the GM Racing +0.5mm valves and a decent ported head.

Webcon have a great Phase 2 map which uses 11:1 CR and stage 2 cams, this should give between 215 and 225 bhp.

The stage 3 cams don't currrently have a Webcon map available, even though my old phase 3 was mapped by them, this is because it had to have bigger injectors fitted due to the 4-2-1 looped exhaust - so it will not be suitable for other engines. Phase 4 map will be available next year

I'm hoping that the engine I've bought will be sufficiently good that I can just drop the pistons and rods in then. If not and I have to get a z22yh block the trigger wheel for the ITBs just bolts on to the yh crank as it currently does for the se?

It would certainly make life easier if I can just swap out the pistons and rods (if I can find any )

Perhaps sticking with stage 2 cams would be the way forward at the moment then if Webcon's map is pretty sorted for this. 215-225bhp seems pretty reasonable to me. I can just pop in some new springs and then if I want to I can always upgrade to stage 3 cams at a later date. All helps to keep the cost down as well so I can spend the money elsewhere

So, my shopping list is looking quite short now:
z22yh pistons and rods
double valve springs.

That can't hurt the bank account too much!

[yaaan]

What bhp are you at now, I would have thought you would be near 220bhp or is that not realistic?

I may be interested in your stage 2 cams if you sell them

Honestly, I don't know. I would imagine 190bhp at best but that's purely a guess. I had about 165ish before the addition of stage 2 cams, ITBs and the 4:1 manifold but what affect these will have had I don't know.

I suspect that I'll stick with the stage 2 cams for now but if I decide to get rid of them then I'll let you know

[Kev S]

What bhp are you at now, I would have thought you would be near 220bhp or is that not realistic?

I may be interested in your stage 2 cams if you sell them

Honestly, I don't know. I would imagine 190bhp at best but that's purely a guess. I had about 165ish before the addition of stage 2 cams, ITBs and the 4:1 manifold but what affect these will have had I don't know.

I suspect that I'll stick with the stage 2 cams for now but if I decide to get rid of them then I'll let you know

OK

I want to get to around this;



'Webcon have a great Phase 2 map which uses 11:1 CR and stage 2 cams, this should give between 215 and 225 bhp.'

I've not even got the ITB conversion yet and my car recently mapped at CS and has 181bhp, only another 40bhp and I'll be happy. For a while anyway

You must have most of the mods done for that stage 2 map but you are now on the lookout for the same second hand parts as me!

[vocky]

crank bearings, block and crank pulley are the same for both the z22yh and z22se engines z22yh has a better oil pump You could just get the z22se block honed, get some new piston rings and fit the z22yh rods and pistons

Edited by vocky, 10 October 2012 - 05:36 PM.

[DarrylB]

Yaan im sooo jealous, I'd love to have funds, time and space to do exactly this! Following this. make sure you put lots of pictures up

[yaaan]

You must have most of the mods done for that stage 2 map but you are now on the lookout for the same second hand parts as me!

ITBs, stage 2 cams, 4-1 manifold and 2.5" system so just need to get that compression ratio up a bit and shed a bit of wait through losing the balancer shafts and the weighty flywheel. That should hopefully do the trick

[yaaan]

crank bearings, block and crank pulley are the same for both the z22yh and z22se engines

z22yh has a better oil pump

You could just get the z22se block honed, get some new piston rings and fit the z22yh rods and pistons

That's what I was hoping to hear Drop the 'new' rods and pistons in an away I go...sort of Maybe I'll try and get my hands on the oil pump as well then, seeing as the engine's already out!

[yaaan]

Yaan im sooo jealous, I'd love to have funds, time and space to do exactly this! Following this. make sure you put lots of pictures up

Apart from the ITBs it's not looking TOO expensice to be honest. The spare engine was a couple of hundred and I'm guessing (although could be wrong) that the z22yh pistons/rods aren't going to make my bank manager cry.

On the subject of space I spent my last break extending my garage so there's plenty of room to work without having to push the bikes out into the rain It also served the purpose of winding up the old bint who lives in the road behind our house and has complained to the council about the extension