2.3 head with 2.6 valves

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SuzyQblue
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Posts: 6
Joined: Wed Nov 04, 2020 8:06 pm
Location: Some beach
Isuzu vehicle(s): 93 Isuzu pickup 2.3 with Weber 38/38 delta 272 valves from 2.6

2.3 head with 2.6 valves

Post by SuzyQblue »

So when I bought this truck the previous owner had put valves from the 2.6 in a 2.3 head. He also put double valve springs. It started burning oil pretty bad so I figured it was stem seals. I was correct. The valve spring retainers were smashing into the seals. Here’s my question. What combo of springs, retainers and seals should I be using. I noticed the only difference between the 2.6 is that the valve heads were bigger and the stems were shorter. The guides and seals seem to be the same. I can’t seem to find a combo that gives me enough clearance but also leaves enough of the valve sticking out the top. Anybody got an idea?
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SuzyQblue
Regular Member
Posts: 6
Joined: Wed Nov 04, 2020 8:06 pm
Location: Some beach
Isuzu vehicle(s): 93 Isuzu pickup 2.3 with Weber 38/38 delta 272 valves from 2.6

Re: 2.3 head with 2.6 valves

Post by SuzyQblue »

Well I haven’t really found anything pertaining to my problem and crickets and this post so I’ve got some crowed springs and retainers that are supposed to be compatible. Right now I’m running it with a random set of titanium retainers I found and the double springs. I really have to change those soon because they really aren’t quite big enough and the springs are walking around underneath them.


Also just put all new rocker arms and shafts because the stock ones were worn pretty badly. Hopefully they the new rocker arms don’t mess with the old cam. When I was installing all that I realized that some of the clips that hold the rocker arms in place we’re contacting the rocker arms. I had to reshape them to clear. I think this was because of the reground cam and the new geometry of the rocker arms. It’s probably what caused them to be worn out. You can see in the pictures where the clip was contacting the old rocker arm and where it was hitting the new one when installed.

Anyway, I hope this helps somebody. This is my first time doing work on the internals of a motor so having to figure all of this out has been a real pain in the butt. Especially when my other truck is broken down and my motorcycle was just stolen. :x :x :x
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puttputtinpup
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Location: Winston Salem, NC

Re: 2.3 head with 2.6 valves

Post by puttputtinpup »

I wish I could help. Have you posed any of your questions on http://www.planetisuzoo.com. ? Knowledge and experience with the 2.3 and 2.6 might be a bit more vast than here. Not trying to brush you off, but trying to get some help for ya.
SuzyQblue
Regular Member
Posts: 6
Joined: Wed Nov 04, 2020 8:06 pm
Location: Some beach
Isuzu vehicle(s): 93 Isuzu pickup 2.3 with Weber 38/38 delta 272 valves from 2.6

Re: 2.3 head with 2.6 valves

Post by SuzyQblue »

Puttputtinpup thanks. I’ll give it a shot. That might be where I saw something about a hybrid head.
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hagasn
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Posts: 344
Joined: Mon May 19, 2008 3:08 pm
Location: central florida
Isuzu vehicle(s): 1991 isuzu pickup 2WD 2.3 4DZ1 engine

Re: 2.3 head with 2.6 valves

Post by hagasn »

update?
i am the original owner of a 1991 isuzu 2WD pickup. the rebuilt motor was bored .040 over with a Calmini camshaft and gemini turbo kit with intercooler. power to the wheels is handled by a centerforce gold clutch.
SuzyQblue
Regular Member
Posts: 6
Joined: Wed Nov 04, 2020 8:06 pm
Location: Some beach
Isuzu vehicle(s): 93 Isuzu pickup 2.3 with Weber 38/38 delta 272 valves from 2.6

Re: 2.3 head with 2.6 valves

Post by SuzyQblue »

Update!! I ended up having to pull the head and have the valve guides pressed in further at the machine shop. Machine shop told me that all the valves sealed good and the head was in good shape otherwise. I ended up using the crowed springs and retainers.

When I went to put the head back on I noticed some divots in the top of the pistons where the intake valves had struck the pistons. :shock: :o I cleaned up the pistons and inspected closely for cracks. All good. They just barely made contact. I think with bigger valves, higher lift cam, and possibly a little shaving of the head made the clearance really tight. I smoothed out my new custom valve relief cuts so the sharp edges wouldn’t cause detonation. :lol: I put the head back on and changed the timing one tooth from where the previous owner had it set. Checked clearance and it was good. This thing seems to have no room for error. One tooth in either direction will cause a valve strike I think.

Either way I got it put back together and she’s running good. Still have to tune the carb and ignition timing a little better because there seems to be I burnt fuel that accumulates in the exhaust and ignites when I shut the motor off.

Next mods are gonna be adding a fuel pressure regulator, a afr gauge I happen to have, and upgrading the ignition. Then I’ll see if it needs rejetting.
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SuzyQblue
Regular Member
Posts: 6
Joined: Wed Nov 04, 2020 8:06 pm
Location: Some beach
Isuzu vehicle(s): 93 Isuzu pickup 2.3 with Weber 38/38 delta 272 valves from 2.6

Re: 2.3 head with 2.6 valves

Post by SuzyQblue »

Oh yea. I have a set of double valve springs that I’m not using anymore if anyone’s interested.
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hagasn
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Posts: 344
Joined: Mon May 19, 2008 3:08 pm
Location: central florida
Isuzu vehicle(s): 1991 isuzu pickup 2WD 2.3 4DZ1 engine

Re: 2.3 head with 2.6 valves

Post by hagasn »

I want to buy another head and have a local shop install larger valves and stiffer springs "GO NUTS" but this discourages me :( I see YouTube video's of Isuzu's in Australia going fast down the 1\8 I think that's what I want eventually :)
i am the original owner of a 1991 isuzu 2WD pickup. the rebuilt motor was bored .040 over with a Calmini camshaft and gemini turbo kit with intercooler. power to the wheels is handled by a centerforce gold clutch.
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