racelj Registered User
Posts: 153
(4/15/06 11:34 pm) Reply
converting front wheel drive motor to rear wheel drive?
just wondering what was involved to change a front wheel drive motor to rear wheel, obviously it can and has been done, you would need to find a suitable bellhouing for the rear wheel drive gearbox, engine mounts, different manifolds possibly.
im looking at a 4ag 20v for my corolla ke25, any info would be very much appreciated, also what would u pay for a 20v silver top engine without comp or loom?
Dont they come in a rear wheel drive version anyway? That motor's used in a lot of the Clubmans getting around. They're all rear wheel drive.
I'd have thought getting a RWD version would be cheaper in the long run. You'd likely need engine mounts, bellhousing, likely need linkages from the pedals to fit, possibly a few subtle changes to things like exhaust and so on.
Edited by: AnotherDatto at: 4/16/06 12:05 am
dave368 Moderator
Posts: 285
(4/16/06 9:42 am) Reply
Re: ummm
Troy,
There is lots of info on Toymods for this conversion. As Paul said, they did come in a RWD version, so you can use that bellhousing and possibly gearbox. I have heard of the W5x series of boxes used as well with the same bellhousing but I would double check this with someone who has done the conversion.
Here are a couple of interesting things I found very quickly on Toymods.
As for horsepower, I used to service for an AE92 rally car with a 4AGE 16v that made 212hp at the flywheel, so theorically the 20v could be more than that. The reason they told me that they stuck with the 16v was to keep the torque down low for the rally car. They had some big cams in the thing too.
Re: ummm
Yes, that too. Most of the info I've seen suggests that the 20V can be a bit torqueless when compared to the 16V version. You have to keep the revs pretty high to get useable torque.
I've heard that the Ford Sierra 9 gearboxes go with that motor ok, as well.
Re: ummm
Try:
www.bilzilla.org
my understanding is that the RWD motor is so rare that is better to convert a FWD and do away with the distributor.
I don't think the 20V makes appreciably more power than the 16V when developed, though it is better stock because it has a better spec (cams, Quad TB's, extractor exhaust). If you work out the valve surface area it is only maginally more than the 16V, take away the restrictions for valve stems and there is nothing in it. There is definately more expertise for the 16V.
taylz Registered User
Posts: 45
(4/19/06 10:53 am) Reply
20Valve 4AGs
You can spend big dollars on either a 16v or 20v 4AGE and end up with a good 210+ Hp. In it's ultimate form, most people tend to think that the 16v makes more power. I know my fairly heavily worked 20V powered KE35 makes around the same power at the wheels as an S15 200sx with a slight increase in boost (about 1.5psi over standard).
In the most basic (read cheapest) form, the 20v is probably a better starting point if you don't plan on spending huge dollars for the previously mentioned reasons.
As far as converting to RWD - a T50 gearbox bolts straight up. 16V extractors fit with minor modification, you'd probably be best getting a custom set made.
RWD engine mounts from a 16V bolt up fairly easy, you may need to slightly modify the crossmember in your '25 to suit.
You would need slight modifications to the water plumbing and you will need to remove the dizzy cap and rotor (leave the cam angle sensor) - Clearance issues with the firewall that cannot really be overcome with "minor reshaping".
When it comes to obtaining a silvertop 20V - I paid around the $1000 mark for one about 2.5 years ago - they should be a little cheaper than that now... (obviously depending on condition).
As previously mentioned, toymods have fairly good resources for conversion tips.
Mark Yager has probably one of the best reputations in the country when it comes to building high output 4AGEs of any type. He may be able to help you out if you are looking for something more than just standard output.
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