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22RE RV (Recreational Vehicle) Engine Question

Old 06-20-2019, 05:24 AM
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22RE RV (Recreational Vehicle) Engine Question



Yesterday I purchased a 1988 22RE engine removed from a destroyed 1988 Motorhome. The Motorhome fiberglass shell was destroyed by a falling tree turning the whole RV into junk. The Motorhome had 70K original miles and was equipped with an automatic transmission. I was able to hear the engine run before removal and it runs great and looks pristine!

I have read about many of the rebuilds of 22RE engines offered by various commercial rebuilder's having the option of installing an "RV" cam which which is claimed to ad 8-10 HP to the engine and leads to my question:

Did Toyota install different camshafts (the "RV" cam) in the 22RE engines that were installed in 1 ton cab/chassis's that were sold to RV manufacturers/converters for their RV conversions?

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Old 06-20-2019, 06:41 AM
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According to the research I have done, Toyota did not offer a "RV" camshaft for the 22RE. There appears to be only one stock camshaft for the 22RE, & replacement cams out there all say they also fit the earlier 20R motor. Valve size, lift & duration all seem the same.

I think there is some confusion about the 22RE as far as the power ratings go. After 1989 Toyota advertised an 8 horsepower rating bump over previous models (1985-1988) of the same engine. I can find no mechanical differences in the engine specs, so I suspect it had more to do with either better ignition or better exhaust handling, or both. The 85-88 rating was 117 HP, the 88-97 rating was 125 HP. By the math that's about 7%.

In any case you've got a great little engine there with hardly any use on it. 930,000 miles to go!
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Old 06-20-2019, 06:58 AM
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The upper intake manifold changed for the 1989 model year. 1988 and older the throttle body points down, 1989 and later the throttle body is level. This is the visual difference, but there may be other more subtle changes. People claim it's better, but I have no experience with this. I know on the 1988 and older manifold there is a decent obstruction right behind the throttle body. The cast in tube for the EGR to flow through obstructs the top portion of the throttle body opening. Maybe someone with a 1989 and later manifold can comment if the same obstruction exists for those years.
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Old 06-20-2019, 07:25 AM
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Can the 1989 upper intake be installed on a 85-88 FI R22E without further modification to take advantage of this better upper intake?
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Old 06-20-2019, 08:17 AM
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First off, I never said it was better, just what some people claim. I've seen no proof and wouldn't give any credit to someone saying it feels faster. If you spent a bunch of time and money to modify something you'd probably claim it made some difference too. The locations of hose nipples are slightly different, you'll need new molded hoses or settle for generic hoses which always look bad and can kink. There are different numbers of nipples at the top of the throttle body so you'll have to figure out how to make that work. Not sure if throttle cables are the same. The whole idle air control system is different. The big ribbed hose that connects to front of the throttle body is different. So it's a whole lot of work for a very small gain (if any). If a truck came up for sale with the swap done I'd be inclined to walk away.
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Old 06-20-2019, 08:31 AM
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That answers that question!!!

Thanks for sharing your knowledge.
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Old 06-20-2019, 11:56 AM
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Originally Posted by vintageracer View Post
Can the 1989 upper intake be installed on a 85-88 FI R22E without further modification to take advantage of this better upper intake?
It is possible and worth it even if only for the upgraded aux air valve. I've done it before on my 85 and it also has better routing. Couple that with a 82 Supra AFM and you got an extra hp
https://www.yotatech.com/forums/f116...e-swap-284813/

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Old 06-20-2019, 12:36 PM
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Originally Posted by se7enine View Post
It is possible and worth it even if only for the upgraded aux air valve. I've done it before on my 85 and it also has better routing. Couple that with a 82 Supra AFM and you got an extra hp
https://www.yotatech.com/forums/f116...e-swap-284813/

Yep, I've thought about it for the integrated wax type Aux Air Valve, but haven't really had strong cause yet to do it.
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Old 06-20-2019, 03:21 PM
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Originally Posted by arlindsay1992 View Post
The upper intake manifold changed for the 1989 model year. 1988 and older the throttle body points down, 1989 and later the throttle body is level. This is the visual difference, but there may be other more subtle changes. People claim it's better, but I have no experience with this. I know on the 1988 and older manifold there is a decent obstruction right behind the throttle body. The cast in tube for the EGR to flow through obstructs the top portion of the throttle body opening. Maybe someone with a 1989 and later manifold can comment if the same obstruction exists for those years.

1988 and earlier intake manifold throttle body opening. You can see the egr tube obstruction mentioned. Fresh shot of break clean to brighten it up.

1989 and newer intake manifold throttle body opening. This one has been bored out to 60mm, but you can see the redesigned egr tube is far less of an obstruction. Another fresh shot of break clean to brighten up the area that was removed.
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Old 06-20-2019, 05:31 PM
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This is gettin interesting.

I am learning a lot.

Thanks for the education.
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Old 06-24-2019, 09:45 AM
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Originally Posted by se7enine View Post
It is possible and worth it even if only for the upgraded aux air valve.
That's the exact reason I did the swap.
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Old 06-24-2019, 10:46 AM
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Exactly what does the upgraded air aux valve do versus the stock setup that makes it worth the effort?
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Old 06-24-2019, 06:52 PM
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Older style has a bi metal heated element in it that burns out/goes faulty and is not made anymore, leaving you with finding a good used one as a replacement. Who knows how much life the new to you used one will have left. It is separate from the manifold and throttle body, so its connected by hoses (also no longer made) that dry rot and create vacuum leaks.

Newer style is passive (has no electric element). Itís more like a mini thermostat integrated into the throttle body, so no hoses to dry rot and cause vacuum leaks. New replacement ones are readily available.
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Old 06-24-2019, 08:16 PM
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[QUOTE=RASALIBRE;52426011]Older style has a bi metal heated element in it that burns out/goes faulty and is not made anymore, leaving you with finding a good used one as a replacement. Who knows how much life the new to you used one will have left. It is separate from the manifold and throttle body, so its connected by hoses (also no longer made) that dry rot and create vacuum leaks.

I recently purchased new early type Idle air control hoses. part numbers 22234-35010 and 22233-35010 These hoses are available.

Last edited by millball; 06-24-2019 at 08:19 PM.
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Old 06-24-2019, 08:44 PM
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Originally Posted by millball View Post
I recently purchased new early type Idle air control hoses. part numbers 22234-35010 and 22233-35010 These hoses are available.
Good to know! Sorry to spread misinformation!
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Old 06-24-2019, 10:03 PM
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