Other Engine Conversions - non V-8 Discussion of non-rotary engines, exc V-8's, in a car originally powered by a Rotary Engine.

1.8 DOHC Swap Starts July 5.

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Old 07-02-07, 02:15 AM
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1.8 DOHC Swap Starts July 5.

This is what im going for.





I think that will look real good in my engine bay.

I dont think it will be too hard to swap in i have the no how and the skill to make everything but i may need some ideas.

Fuel is easy to make happen( thank you mazda for inline fuel pump)

Engine mounts are simple to make once i get the position figured out.

Exhaust will be easy but not fun.

Computer is easy but ill have to make a custom dash.

Tranny mount is agian easy but will take positioning

????If there is anything im not thinking of but you guys are let me know.?????

I am planing on doing the full write up and pics of everything i make and things that i buy. So if this swap goes well others can follow it.
Old 07-02-07, 11:22 AM
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i sure hope your going to put that in a civic......
Old 07-02-07, 11:28 AM
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Stu-Tron Get Yo Groove On

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Your forgetting the rotary.
Old 07-02-07, 01:25 PM
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as many rotaries as he has gone through, i dont blame him... i was going to do this when mine give out.. but i hope you plan on doing a custom ITB because the kit is like 2k with a reflashed ecu, and like 3k with a tuned standalone. but with a custom manifold, megasquirt and motorcycle itb's you should be able to pull it off...let me know how it goes, maybe then you can help me with mine when i do it... but when you buy a 1.8l motor, dont get the 91 year engine, it had a short nose crank that was prone to breaking.
Old 07-02-07, 04:51 PM
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what 1.8 are you using? honda B18? miata? if youre using a honda, what tranny are you using? what are you building this car for?

ive seen a fast as B18 powered hatch at my local strip consistantly run 10s and break into the 9s. it was a guys DD also.
Old 07-02-07, 06:34 PM
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i was assuming the miata...
Old 07-03-07, 04:54 PM
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That is a miata engine.
Old 07-03-07, 07:16 PM
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correct its a Mazda Engine.

I picked up the engine today and it has 56,000 on it and i got it for 100$

A used 5sp runs about 150$

and i have to find an ecu and most of the stock sensors and fuel system, no point in spending all that money if i cant get a stock one to work first.
Old 07-05-07, 04:29 PM
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are you going to modify the stock FB gas tank and make the feed line bigger?
Old 07-06-07, 06:51 PM
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Im not going to use the stock fuel tank Im building a new one.

But it would not be hard to do ill make sure i include how to change the fuel delivery in my write up.
Old 07-14-07, 10:44 AM
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whats the update?
Old 07-14-07, 11:02 AM
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no boost=fail
Old 07-14-07, 08:41 PM
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all that work for what, 160bhp?
Old 07-15-07, 10:45 AM
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K I was thinking about that the whole time. Like the above statement. But I wasn't sure if these were suppose to be an engine with alot of potential or what, but I mean even a stock 350 or even a stock 302 would be better then that man. But wouldn't mind seeing pictures of though
Old 07-22-07, 03:18 PM
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Wow thats a great price!! I got the "hookup" on an engine for my miata and it cost $550 and it had around 70k on it.

Originally Posted by Man_in_black49464
correct its a Mazda Engine.

I picked up the engine today and it has 56,000 on it and i got it for 100$

A used 5sp runs about 150$

and i have to find an ecu and most of the stock sensors and fuel system, no point in spending all that money if i cant get a stock one to work first.
Old 07-22-07, 05:35 PM
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The problem is when you toss a small block cast iron into a FB it throws the hole turning dynamics of the car off.

I wanted something light and that could put out if "i spent the money" around 300 hp.
Old 07-22-07, 08:24 PM
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sounds like a fun project, let me know if you need a tranny as I have an extra.
Old 07-23-07, 06:06 PM
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honestly man I am not tryin to convince you go sell that and buy a v8 but the whole "weight ratio" "it being ALOT heavier then a rotary" and "will fubar your turning" isn't true man. Perfect example is my buddy has a FB with a 355 in it and he uses it in both drag racing and in road racing and in road racing he has one of the best overall vehicles out there. And I have driven it also and it takes corners pretty nice I must say. But again please dont get all bent outta shape thingy that I am trying to say my way is better or anything like that. I am just stating my opinion on it from first hand experience thats all.
Old 08-12-07, 11:02 PM
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Project scrubbed for this year look forr an update this spring.
Old 08-31-07, 01:11 AM
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some people like revy little engines. any word on using rx7 transmissions? I know that they are close to miata transmissions but I have never heard of anyway you could bolt a BP engine to any RX7 transmission. does anyone know?
Old 08-31-07, 11:19 AM
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They have adapter plates out there for any tranny mating. I know Miata guys have used rx7 tranny in the miata.

You can boost about 12 psi easy on that b18. I did 18psi on my b16. You will get about 275 rwhp in doing so.

It is a fun motor to play with and easy to replace... 5 years ago i got a replacement for 400 bucks and parted out what i did not need (actual cost at the end 150-200.oo).

I recommend using the miata tranny w/ your rear. The gears are tight the miata so the low output isnt so bad.... and the rear is a 430 if i recall. The 7-tranny w/ a rx7 rear... too long in my opinion.
Old 09-23-07, 10:12 AM
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After getting the BP in there why not jump in and swap on a FM Turbo kit? Outside of being OEM reliable it is also a seriously well detailed conversion for the BP 1.8L.

Look up Kieth at Flying Miata for more info on the kits available.
Old 09-19-08, 06:30 PM
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I should really finish this project before i start the Mach 5.
But i think a movie care is better then miata'd 7
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