Mini-me Thread For Gearhead98

[Calesta]

I got this in a PM from gearhead98 today, and now I've added the top line back into my signature. All you n00bs out there take notice! Use the forums to ask tech questions. I don't like answering tech questions by PM, and neither do a lot of the more knowledgeable people on just about every single forum out there. Forums are here for you to use- use them and ask questions HERE. That way, everyone can see your question, everyone can answer, and most importantly- everyone benefits from the discussion. The staff on a forum are not there to be your personal technical answering service.

If you're being too lazy to use the forums to ask your questions, you don't deserve to have them answered.

Since I'm such a nice guy though, I've moved the contents of the PM to a thread and will answer right here.

hey whats up,

i am doing research on a mini-me and can't find out some stuff[/b]

You're not searching hard enough.

i want to know what the compression would be if i used the stock Y7 pistons and put on a Y8 head, i dont know much about the head gaskets available or how much they will change the CR[/b]

I assume that you're using the stock D16Y7 block. Using the standard Y8 head gasket and the Y8 head on the Y7 block will give you 10.7:1 compression. Here's a D series compression calculator- learn how to use it.

http://www.knology.net/~jediklc/D.htm

the engine has almost 101k on it, so i might put in new rings and bearings when i do this, so changing the pistons is an option, but i was hoping not to.[/b]

Run both a compression test and leakdown test. Both together will tell you if you even need to replace your rings. If you have the resources to change out your rings and bearings, go ahead and do it- it's always nice to run on a freshly rebuilt engine. While you're in there, go ahead and change out your pistons. It's not hard, especially if you're already pulling the stock ones out to put new rings on. A good choice for a D16 mini-me is the PM7 piston. It came in the DOHC ZC and is also marked as "P29" in some engines. It has the largest dome (7.2cc, .04" below deck on D16) out of any of the D series pistons, and will push your compression up to 12.6:1 with a Y8 head and a standard Y8 head gasket. If that's too high, the PG6B piston (1.5cc dome. .00" below deck on D16) from the 88-89 Integra's D16A engine is also a good choice- it gives you 12.2:1 compression with a Y8 head and gasket.

also with this swap i was hoping to be able to run off either 87 or 89 octane, but if the compression goes up to high to the point of neededing premium, i will change the pistons to lower it again.[/b]

High 10s for static compression generally isn't good to run on 87 or 89 octane gas. You'll want to keep your compression in the low to mid 9s. If you're going through all this trouble, why not just swap in an entire low mileage D16Y8 engine? You'll spend less money, have less stuff to take apart, and you can still run 87 octane gas on it. The pistons you would want to put in to run pump gas would be the stock P@P pistons from the D16Y8 anyway, so all you would have in the end is a rebuilt D16Y8 block with 9.6:1 compression.

if i have to lower the CR what pistons should i use to keep it around the same CR as i dont plan on boosting the engine so i would not want to lower the CR too much
any help you can give would be great[/b]

Just swap in the entire Y8 engine. If you're willing to run 91 or 93 octane gas, then crank up the compression- otherwise keep it as close to stock as possible.

i have also been reading that the z6 head flows better then the y8 head, which would net more gains if i did the basic i/h/e and a y8 TB and y8 IM[/b]

Supposedly the Z6 head flows better, but I don't know of any kind of real evidence supporting it. The Y8 manifold does flow better than the Z6, so go with that if you can get it.