12-05-2008, 06:27 PM
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#1 (permalink)
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EcoModding Lurker
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'89 Civic HF Engine Swap
Pending confirmation of a blown piston ring, I'll probably be doing an engine swap.
I have a lead on a cheap, mid-mileage (135k) CRX-HF motor (50mpg EPA ), which I'll be swapping into my civic hatch.
I'll probably do a mild rebuild before the swap to make sure everything is in order, but if this actually happens, it will be quite a straightforward swap, and maybe +10mpg!!
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12-05-2008, 07:20 PM
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#2 (permalink)
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Master EcoModder
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I believe(?) this is the engine that powered the Awesome Super CRX! I could well be wrong. But that CRX still holds the title for most cost effective car in all of history(The EPA actually only rated back to 85 I believe for that study).
It's a Honda engine, what kind of. . .well you said its a hatch so is it a DX or a CRX? I don't think they introduced the DX until 93 so yours must be a CRX. Should be plug-and-play since there was a CRX equipped with that engine anyway. Sounds interesting will be very interested in results and struggle(hopefully none but if there is any will be interested).
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12-05-2008, 07:27 PM
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#3 (permalink)
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Dartmouth 2010
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Don't do it! Put in the VX motor,
But yeah, straight swap. Make sure to get the tranny.
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12-07-2008, 02:54 AM
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#4 (permalink)
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EcoModding Lurker
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I checked the compression out today.
Cylinder: dry measurement -- with a bit of oil
Cyl 1: 185psi -- 215psi
Cyl 2: 110psi -- 115psi!!
Cyl 3: 180psi -- 215psi
Cyl 4: 185psi -- 215psi
I also popped the valve cover off and checked the valve clearances for #2 - they look fine so I don't have a stuck-open valve. One could be slightly bent I suppose, or maybe a valve seat is F*ed? Could it still be rings, even with the oiled compression test being the way it is? My logic tends to lead me to a valve problem, but I'd have to pull the head off to investigate this further.
In any case, I think I'm going to buy the HF engine. It's too good a deal to pass up - The seller is more of a turbo dude and doesn't appear to know/care what he's got.
I've got a 4 speed currently that should mate right up. I just asked if he still has the HF 5 speed (maybe his is an auto, I dunno) He didn't say the transaxle was for sale, but maybe... If not, there's someone maybe selling one right here in town, for a decent price.
<silentrage>
I'd never buy a car with an automatic transmission. Ick ick ICK.
</silentrage>
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Last edited by millenniumtree; 12-07-2008 at 03:01 AM..
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12-07-2008, 10:07 AM
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#5 (permalink)
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Master EcoModder
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Quote:
Originally Posted by millenniumtree
In any case, I think I'm going to buy the HF engine. It's too good a deal to pass up - The seller is more of a turbo dude and doesn't appear to know/care what he's got.
I've got a 4 speed currently that should mate right up. I just asked if he still has the HF 5 speed (maybe his is an auto, I dunno) He didn't say the transaxle was for sale, but maybe... If not, there's someone maybe selling one right here in town, for a decent price.
</silentrage>
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I would bank he wants a new trans. If he is a performance type and is willing to switch engines to get there he is probably also looking at droppin in a six speed. Since thats one of the most effective ways to gain top speed and or greater acceleration.
<edit> This is how I obtained a spare five speed manual for firt cheap. </edit>
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12-08-2008, 02:07 PM
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#6 (permalink)
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Master EcoModder
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The HF was only available with a 5-speed manual transmission. With tall gears, and a tall final drive. The 5th gear set is somewhat prized by D-series folks, as using it is an easy way to drop freeway RPMs.
-soD
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12-11-2008, 12:08 PM
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#8 (permalink)
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EcoModding Lurker
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Looks like I won't be able to get the motor. He got an offer that is way over my budget.
I might rebuild the engine I have. I've already done the head gasket on it myself - taking the bottom apart is just the next logical step, right?
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12-11-2008, 04:06 PM
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#9 (permalink)
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EcoModding Lurker
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If you're near Chicago and want a cheap HF, this guy wants it gone and he might be able to give you a deal. <$150
Shoot me an email if you're interested and I'll send you his email. It was on craigslist but the posting expired.
millenniumtree gmail
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04-29-2010, 10:54 AM
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#10 (permalink)
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EcoModding Lurker
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After sitting for far too long, this project may get a bit more interesting.
I found an HF motor (long block) for $25. It has a blown head gasket.
If my existing head is OK, I can drop it onto the short block with a new gasket and have a running machine in no time. If my existing bottom end is OK, I can drop the HF head on with my intake manifold and have it running again.
The motors are slightly different, but I think the blocks are identical.
Polymer has been sitting for way too long - I want to get her back on the road.
She'll also need a new exhaust, new tie rod ends (at least), and a battery.
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