cityofcaterpillars

Im going to the junk yard to get a block this week to put my z6 head on. There are like 50 y7 blocks many with low miles or the cars were totaled so less chance of motor trouble. There is one lonely z6 motor. It has alot of miles and the car is riced out so Im sure it was beat on.

Is the Z6 block really that much better that I should take a risk on it over a y7 block?

tony_2018

you're rebuilding the motor, shouldn't matter how bent on it got, whatever you meant by that. Unless your definition of rebuilt is different than what the rest of us thinks.

cityofcaterpillars

sorry beat is what I meant. by rebuild I meant new bearings and rings. I shouldve been more specific. Id rather not do that if I don't have to.

tony_2018

Holy ****....no that is not a rebuild dude....no.

cityofcaterpillars

yeah haha sorry about that. Didn't know what else to call it.

So what about the original question

eghatch9295

iTrader: (1)

z6 is much better. y7's spin bearings just like y8's

cityofcaterpillars

what causes it to spin bearings so easily? Is it too much HP? Im only shooting for 200-220 HP

Ohmega

iTrader: (1)

The Z6 has different crank oiling than the y7. I believe there are 2 oil holes per crank journal rather than 1. 200 is safe for a d series, keep in mind torque is what breaks parts, not horsepower.

eghatch9295

iTrader: (1)

/\ nailed it.

DooDooBrownEg

Ohmega is right, the Y blocks don't have as many oil passages for the crank as the Z. Thus the spun bearings. You'd be safer with a z6 if you planned on building it to the hilt. For a daily, it shouldn't matter Y or Z as long as you're not raping it all day.
Best of Luck

cityofcaterpillars

It will be seeing boost at some point this summer nothing over 200 HP though. Ill probably go with the y7 just because it'll have lower miles and they're easier to get to in the yard. The car with the z6 is buried and not on blocks so it would be a pain to pull the motor.

Bull Steed

cityofcaterpillars

is there anything that can be done to help with the oil issue

DooDooBrownEg

No, not for the Y's. It's all in the design. If you plan on boosting your single cam, z6 are the way to go. Y's just have too many spun bearing issues, I've even seen it on one that was boosted less than 10psi. If you truly want to boost it, just wait and plan for the z6.

Bull Steed

I think that is very well-said advice.

Personally, If I ever look for another Civic, I'll look for a Z6 engine, not a Y8.

94EG8

It's not the block, it's the crank itself. Throw a Z6 crank in a Y7 block and there really isn't any difference between it and an actual Z6 other than things like CKF mounting provisions on the oil pump and dipstick location.

DooDooBrownEg

Now that's just preposterous!! lol jk that would work, but there are always glitches in the matrix when you try to Frankenstein that many pieces together... Best of luck ppl

cityofcaterpillars

ugh. Now I don't know what to do. I'd rather not replace the crank. I was going for easier over harder in regards to frankensteining anyways.

tony_2018

Than this is not a rebuild, you're expecting us to tell you which block to choose so you can do "less" of a rebuild. Understandable if you're tight on the mucho but in all honesty its not going to be worth it down the line if you have plans. Whatever the **** they are.

cityofcaterpillars

I was just looking for the pros and cons of both blocks and for some opinions on which way to go. I'm new to engine building and just wanted to make an educated decision

eghatch9295

iTrader: (1)

then get the z6. z6/a6 are the best usdm sohc blocks, period.

tablecivic

the y8 is fine just the heads are shitty .. kind of like the b20 of single cams.

eghatch9295

iTrader: (1)

what in the **** are you talking about? the y8 block sucks, the head is fine. the low comp b20 block is trash, the rise in its popularity is due to the abundance and price of them. as to your goofy statement about the b20 head, all i have to say is p8r. thin cylinder walls + 84mm pistons= no thanks. hypocrite time- i use a b20 (high comp) in my track car. it is NOT because i think its a great motor, its because i can grenade them all day and replace for 4-500.

tablecivic

ok in my opinion from experience the y8 has a shitty head, just like the shitty head on a b20 ( besides the p8r ) i comprehend that a b20 is cheap, i have bought a few just to use the block because the heads are shitty.

some like b20's because they are cheap others like pickles instead of cucumbers .......