whats up guys, tried searching but i wanna sure

i have a 94 hatch with a d15b7 and its got about 247xxx miles so its been burning some oil and i have a d15b2 that apperently is fresh. I wanna know, can take the d15b2 block and put my head on it and throw it in ? I read mixed opinions about this. Some say the cam gear is different and you need a b7 belt. Some say when the trans lines up to the block the shaft has too many teeth? Does anybody know for sure because i have to finish over the weekend as it is my daliy and work is 45 minutes away. I'm just not really feeling that walk.

 

I swear if I search and find a DIY on this combo I'll scream.

 

Do a search for year for the D15B2. Then do a search on d series transmissions and their differences.

I'm pretty sure I've read the older years (like in the 88-91) range transmissions did have a difference in spline count on the input shaft.

If you have the cable tranny for the d15b2 then I believe you could use your B7 head but then you also would have the challenge of changing the cable tranny to be a hydro capable tranny. There are kits for this.

Simply, deal with the burning oil of the b7 for now. Research more and then get everything you will need to do any such swap. Right now you don't have all the information, parts or time to do what you wish to do. At the bare minimum you are missing parts and sourcing them in 2 days and doing all the work just isn't a reasonable expectation right now.

Personally, a full engine swap would be faster and easier and go a lot smoother, especially if you find a good condition used B7 to replace your tired old B7. They are cheap motors and are a dime a dozen in these parts. It's the vtec of the era that is a bit more scarce and pricier.

 

the b2 block works fine. personal experience.

 

Actually it depends on the year D15B2. If it's an 88 B2 then you will have a problem with spline count. If it's an 89 or later B2 then it should work without issue.

Just looked it up and the 88 is the one with the different spline count, as can be seen here.

I knew I had come across this info, just couldn't remember the exact details. And the D15B2 ran from 88-91 so odds are in favor of the 20 spline but the first year was the 21 spline. The B7 is the 20 spline tranny if I recall.

 

spline count wouldnt make any difference. op would need to reuse his clutch parts if the b2 happened to have the oddball spline count clutch kit on it. hell, you can even use the 89+ pressure plate/flywheel on the 88 trans, if you use an 87 prelude disc.

 

I just woke up and realized I am a dumbass sometimes. Then I read your posts and confirm, I am a dumbass sometimes. The clutch and flywheel would be swapped out and no problems matching the b7 tranny up. And then read your posts and it says the same thing that popped into my head as I woke up.

My bad.

So really if there was to be any issue it would be about deck height variance like the mini me situation but you've confirmed it's not an issue from your experience.

 

yep. the b2 is essentially identical to the b7, with the exception of being dpfi

 

Well I ended up doing what you said and got another b7 block so I could be a little more reassured it would work .

 

the b2 is identically the same. did you read the thread?

 

I wasn't suggesting just a b7 block but a full engine so all you had to do is a swap.

But yeah after eghatch pointed out that the b2 block and b7 block are virtually identical, you were good to go the long route of pulling your engine, ripping everything off including the head, replacing the head gasket, IM gasket, the exhaust gasket and putting that all on the b2 block with the b7 head. Then swapping over the flywheel and clutch to the new b2 block and then putting the motor back in.

Bit more work. If you already got the b7 block only and still have the b2 block, just see if you can return and get your money back for the b7 since you know that the condition of the b2 block is good (supposedly).

Either way if all you have is a block you have a bunch of work to do. Might as well replace the rear main seal, front main seal, timing belt and water pump and tensioner while you are at it. And replacing the pilot bearing in the flywheel while it's off with an OEM one isn't a bad idea either.

A lot of work but a solid engine refresh it would be.

 

exactly. i ended up using a b7 block and head and i reaplce all my gaskets and did a tune up. I have to put my axles in & my buddy took my automatic gear shifter completey apart so i need to figure out how i can get that back together and i should be good to go.

 

​​​​​​I have an '88 Civic sedan that has been set up for mpfi and I bought a '91 Crx d15b2 with a cable transmission. My question is, can I use a d15b7 from a '92-'95 Civic without having issues? Thanks for your time and help.