2ndGenGuy

I've been dying to do this swap since I ordered my engine a little over a year ago. And I finally was able to get started on it yesterday. This B20A is from the JDM 1985-86 Honda Prelude and Honda Accord. It's not really a B-series motor, but it is DOHC and puts out 160hp. It's not the same as the one from the 3g Prelude either. It's basically the predecessor to that engine...

So anyways, I pulled out the trusty 310,000 mile ES yesterday (stock 86hp) after I had a big carb on it, and full headers / exhaust I dyno'd 97whp:

http://www.flickr.com/photos/jgturk/3224738386/
Ripped everything out of the engine bay:

http://www.flickr.com/photos/jgturk/3223881425/
Dropped in the B20A:

http://www.flickr.com/photos/jgturk/3223884587/
And here's how the mounts are, still needs work to get it the right way.

The left side mount needs to be flipped over, for some reason the bolt holes from the ES to the B20A are reversed...

http://www.flickr.com/photos/jgturk/3224740572/
The front mount lines right up, so I didn't get pics, but the one on the back it a bit high, and seems to cause the engine to sag. I think it's because it's a 2g Prelude bracket, instead of the 3g Accord one. The 3g Accord bracket should fix the problem.

http://www.flickr.com/photos/jgturk/3224741828/
And under the car, the engine just needs to be shifted over a bit...

http://www.flickr.com/photos/jgturk/3223885563/
So yeah... it's sorta in. Today, I'm going to make all the mounts fit up proper. Then start hooking everything else up.

katzenjammer84

Cool beans man. Gonna leave the motor as is, or are there future plans?

badboyr66

oooooo keep us updated

E-AT_me

looks great. good luck!

2ndGenGuy

So after spending about 4 hours trying to remove a rusty as **** bolt, I spent the rest of the day ****ing with the mounts to get it tweaked just right...

So, here's my update, I'm finally not too lazy to write.

Here's a pic of the front mount. Lines right up.

http://www.flickr.com/photos/jgturk/3228066640/
The rear mount, I took off of the other engine. This is actually the 3g Accord bracket, instead of the Prelude one. Makes the engine sit much better.

http://www.flickr.com/photos/jgturk/3227212819/

Here are the brackets, side by side. So you can see the difference.

http://www.flickr.com/photos/jgturk/3228062556/

Here's how the side mount fits in the engine bay.

http://www.flickr.com/photos/jgturk/3227211735/
The way the mount looked before

http://www.flickr.com/photos/jgturk/3228061182/
And after

http://www.flickr.com/photos/jgturk/3228063602/
Basically I just had to weld in, and redrill the holes. I thought about just flipping it over, but as you can see from the picture below, it would have made the mount sit way too low. Not only that, but the big bushing was designed to carry the weight of the engine. Not if it's flipped over...

http://www.flickr.com/photos/jgturk/3227207253/
So I've got the engine in the bay... but there is an issue. Mainly the transmission is really close to the rear crossmember. I think it's going to hit, not only that but there seems to be some sidways stress on the rear mount. So I'm going to redrill the bracket so that I can adjust it.

And as suggested on 3geez, I'm going to see if the ES side mount will bolt onto the B20 block. If so, I'll have to go get the stock engine mount at the junk yard, and bolt it back into the car.

ImportHatch

Wow unique build, can't wait to see some updates....

1grex

Yeah I'll be checkin this one often. frackin cool!! surely nobody's done this yet(?)

ALLxMOTOR EG

that's gangsta! keep it up

ian1006

Good stuff man. What was the main reason for going with this motor? Nice to see something different though, motivates me to do something crazy with my Civic

2ndGenGuy

I wanted to go with this motor because it's quite a nice torquey engine. It's sort of period correct, being from an 85 Prelude. The mounts all line right up for the most part. And I thought it was pretty sweet making 160hp without any OMGVTAK!!

To update my progress, I just scored these on eBay:

http://cgi.ebay.com/ebaymotors/ws/eB...6844&viewitem=



Oh yes, 38mm bike carbs baby! Should add some nice bite.

I also found a 1st gen Teggy distributor for it, so I can use vacuum advance, since I'm running carbs and won't have the ECU to run the electronic advance. So more pics coming later!

ALLxMOTOR EG

interesting

MustardCat

Nice, will be pretty quick, quicker than my A20! But I would stick with F-I, I bet a 3G lude harness and ECU would run it.

ian1006

Pretty interesting project your getting into. I wish I had some kind of fab skill to do something like this. No welder or major power tools yet for me Please keep this updated as often as possible

2ndGenGuy

So I thought I would update this thread, since it's been a good long time. I keep this posted over a 3geez, and don't really bring all the details over here, since it would probably be boring crap to a lot of people.

Basically, I've got it in the car, wired, and all the coolant lines taken care of. I stripped the emissions wiring out of the car, so the engine harness only has maybe 5 connectors on it. Alternator, starter signal, coolant gauge signal, and oil pressure signal. I'm sure theres one more thing but I can't think of it.

Running an Integra D16 distributor. Pulled out the cam angle sensor and replaced it with a cap. Installed the stock Alternator and adapted the power steering from the stock motor to work on this block.

Also "built" a manifold for my motorcycle carbs. I basically chopped up an A20A1 intake manifold and cut the runners off and tapped the runners for vacuum.

http://www.flickr.com/photos/jgturk/3509766404/
I put some nice silicone reducers on that fit the manifold and the carbs nicely. Used t-bolt clamps on the carbs, but the runners themselves were oval shaped. So regular hose clamps seem to be doing the trick.

http://www.flickr.com/photos/jgturk/3508953215/
Here are the carbs mounted with my prototype "ghetto" radiator hose couplers.

http://www.flickr.com/photos/jgturk/3481615797/
It's kinda nice because I can reach behind the engine now to get the oil filter instead of crawling underneath the car and up around the axle and burn my arm on the exhaust.

Here's a video of it running in it's current state:


It runs pretty well, considering it's got the stock jets set up for a 750cc motorcycle. It is a bit crappy due to the fact that it's way lean. AND the carbs were cold, you could hear me letting the choke off when it would start stumbling. After a short few minutes it runs much better.

So that's it for now. After I get my throttle cable and choke cables set up in the car, and get them rejetted, I will have video of teh awesome powaaaaa!

nus_dogg

Motor runs great man! Great job, keep it coming.

81cord

Nice

E-AT_me

great updates man. it's pretty wild!!

apekd

wow, VERY interesting man! im in for more from this!

NW Classic Honda

Subscribed...

daddy

iTrader: (1)

interesting swap!

2ndGenGuy

Well I am super bad at updating, but I've got everything running now finally. I had to rebuild my front suspension, new balljoints, wheel bearings, and tie rod ends, before I could feel comfortable driving it again. My bike carb manifold has been mailed off to have some runners welded onto it, so for now I'm running a single Weber downdraft carb on it just so that I can drive it around. It goes pretty good even with this carb, which I believe is undersized, defintiely not getting full power out of it.

But I have already smoked two Civics with it pretty badly. Got about 4-5 car lengths on the last one from 70 to 100mph. He was probably running a D15 or something though. Not bad, but I know theres much more to be had. Here's a video with the Weber on it for now, since I know a bit better how to tune the Weber, and I have a big meet to go to this weekend.

http://www.youtube.com/watch?v=REyM20EdTYM

ian1006

Gangsta...post pics when you get the new manifold back.

2ndGenGuy

Absolutely!

AbitAvenger

any updates on this? i just picked up an 85 accord

2ndGenGuy

Uh yeah the update is that the oil pump is bad or something got plugged in my oil system, and I toasted the top end so it's rebuild time.