I was just wondering is it posible to just swap the head and ecu from a vtec on to a SI? or is there diffrences in the engine block? Like the parts are better balenced for the higher rpms or the oil drains are diffrent or some thing of that sort.

The Si has a D-series motor. The VTEC model has a B-series motor. They are physically incompatible and you won't be able to swap heads between the two.

aww man that sucks, That would of been great if it was that quick and that easy. And i read some where in the forums that the motor mounts are diffrent on the Vtec is that true?

You would think that they would leave the mounts the same, They wouldent change the frame around for 2 diffrent car models would they?

The places where the motors are mounted are the same on the Del Sol, but the mounts that attach the motor to those places are different between the D-series and B-series motors.

The motor designs are physically different so the mounts had to be changed somewhat to allow the motors to be mounted in the same position and use the same mounting locations between models.

Your Si still is a SOHC VTEC, but if you're looking to put a B16 head on it, you'll have to swap the entire motor for the B16.

Ok that so i just would have to get the mounts from a del sol vtec model, shouldent be to bad. But one very last question the dohc vtec still mounts up to the si trans right?


Well i dont have a del sol as of right now, but they are just so hard to find expectly the vtec model and i was just wondering how diffcult it would be to swap them out. I know the 1.6 dohc vtec is readly avaible and performance parts are avaible because of the civic. So basicly i was just seeing if its worth getting a SI or should i wait, wish and dream for a Vtec model.

O yeah and thanks for the info on the last two questions.

si tranny won't bolt up to a b series engine either :)

Ahh geez you have got to be kidding me! i soupose i will need a all new diff. and axles and shift linkages to?

arghhh... the blind leading the blind! Your basic engine swap, if it's from a good company, is the engine block, head, transmission, and all the linkages. Really good companies do all of the above plus the axles/cv joins/control arms... basically everything from the engine to the rim. The D blocks are all SOHC, and thus are interchangeable within their series... D16 tranny will bolt to D15 block, D16 head will bolt to D15 block... yadda. The B series is the DOHC series. Go search online for engine swaps, and please.. I beg you.... have a pro install it...

---not bad for 4am drunkenness :D

I swaped my first engine when i was 13 years old (with the help of my dad of course :smile: ) So i would do it my self. That is crasy that you have to swap out every thing just to go from SOHC to DOHC.

"D-series motors can make serious power if done properly, but B-series motors can readily drop into the Del Sol as well. If you have a manual transmission Si, then you would simply need to change the motor mounts for a B-series to fit. If you have an automatic transmission, then you would need to cut off and weld on the proper transmission mounting point from a manual transmission Del Sol and then you can use the proper B-series motor mounts." (Plastic_Fork)

That was in the "best path to take on a si" thread. LoL now that i know what the motors are called i feal dumb cuz there are alot of posts about it. So will or wont it bolt to the trans¿

But i have been looking for pages with info for the past few days (since i made the first post) and have only come up with pages about civic and crx engine swaps cant find one for the del sol. But if you had any good pages laying in your favorites that would be very kind of you to post them here for me.

You have to swap everything. Think of it this way. D15 block I can lift without a jack. B16 block I have not a prayer of budging the sucker. You're literally dealing with twice the engine. Look at your sol now. See all the space around the engine? That gets GONE when you put in a DOHC. And I really wouldn't recommend doing it yourself.. The VTEC wiring is a nightmare. Anyone can take out an old D block and put in a new one. DOHC is a totally different beast. You need the block, wiring, TRANSMISSION, gauges, etc. Some engine components, like the radiator, from a D block will work on a B block, but you get the best results when you swap out everything. It's a pretty extensive swap. I say get a pro to do it because while you may know cars, you have a LOT to learn about hondas, and even more to learn about sols. For example, del Sol sites usually don't exist, but 95% of the parts are interchangeable with 92-95 civics, and about 85% of the parts are interchangeable with the last model crx (91, I believe). But seriously... you have a lot to learn about the engines and the cars before you try something like this.

I know i dont know about hondas, i know mitisubishis/dodges. but I have always wanted a honda. I could straddle of facts all day about my engine and car and the diffrences in blocks and transmissions. But your right i havent really studied hondas yet.

Thanks for the help ye-all

Here's basically a rundown of what you'll need to swap a B-series into your Si:

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

Bear in mind you should get the Del Sol VTEC dual-core radiator as well. Need a radiator designed to properly cool a B-series. Might need some other stuff as well in addition to the wiring you'll have to do.

Here's a shot of what a stock VTEC model engine bay looks like to give you an idea versus your Si motor bay:

http://bellsouthpwp.net/j/0/j00/delsol/engineshot2003_5-15-03.jpg

Thanks you, thats awsome. LoL i found a great deal on a b16 motor comes with every thing for the swap (except the radiator). Now all i need is the car lol.

Thanks once again you guys have been great. If you have any other helpful sites about del sols please let me know.

When you get your Si, keep this in mind. If it's '96 - '97, then get a B16A2 motor from another Del Sol VTEC from those years or from a '99 - '00 Civic Si (same motor). These are OBDII and will allow you to use your current OBDII ECU. Otherwise get the B16A3 (OBDI) if your Si is '93 - '95 since those Del Sol's were OBDI. You won't have to do an OBD conversion that way.

I wouldn't recommend getting a JDM motor as there is more to making it legal here in the US than most people think. Plus, you might get a first gen B16A if you're not careful which has a cable clutch and not a hydraulic like the Del Sol's use. You'll save yourself from being ripped off that way.

As for other helpful sites, try here:
http://www.teamdelsol.com/

And hit the link in my signature for the Team Del Sol message board.

Going from Del Sol Si to Del Sol VTEC?
Wondering what parts you need to go from a D-series to a B-series?
Wondering what else you need to to that people often forget?

THE LIST
-B series motor
-B series tranny
-Del Sol VTEC engine mounts (all three, tranny, rear and driver side)
-Del Sol VTEC shift linkage, both bars, CIVIC SI WILL NOT WORK!!!
-Del Sol VTEC axels
-B series wiring harness and ECU that matches vehicle's current OBD status. 93-95 OBD-I 96+ OBD-II
-This web site: http://tech.hybridgarage.com/tech/5gtech/index.html
Here is a list of wiring you'll have to either verify or change to make your car run right after the swap. I'll tell you now that you'll have to run the Knock Sensor lead to ECU pin out D3 because you current motor DOES NOT have a KS. The rest should be good.
-B series Radiator (Del Sol VTEC from Honda stealership only, Integra GSR from most popular shops)
-Del Sol VTEC Upper and Lower radiator hoses (again Honda stealership)

Well that should just about do it! Any questions or comments you can post here or reach me VIA email, I'm hardly on AIM.

Sweet thanks again, Hey when you say
"if you're not careful which has a cable clutch and not a hydraulic like the Del Sol's use."

Do all year Del Sols use hydraulic? i though it was only like 96 97?

Yep. All Del Sol's use a hydraulic transmission. The JDM B16A 1st gen was a cable transmission. Came in the JDM CRX. The B16A 2nd gen came in Del Sol's and used a hydraulic transmission. About 1992 is when Honda switched to hydraulic transmissions.