How To: B18C1 intake manifold onto B18B1
#1
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How To: B18C1 intake manifold onto B18B1
**sorry for the large pics, I'll fix them with thumbnails later today**
Mods, move this to any subforum you think is best.
I tried this because I'm putting a JRSC originally for a GSR on my LS after I fix the blower.
I just wanted to make sure redrilling an IM flange can work.
The JRSC manifold has enough meat for all head designs (itr/gsr/ls), so that should be easier.
It ended up being very simple, aside from tapping the head's EGR port deep enough for a 3/8" flush plug.
In WI we have heads with the port, but no EGR components. (FYI you need to tap at a slight angle, away from the cam seal.)
The rest was just some mild drilling & grinding on the flange for the different stud locations.
One key part is the intake gasket. The shape of the OEM LS & GSR gaskets don't work with the coolant/egr port differences,
but a Hondata/clone phenolic gasket for a B18B1 makes it work. If you really want to go wild,
you can port-match the wider IM runner to the head.
Here is a cheap P2R gasket for a B18B1 over the modded GSR intake manifold:
Here is the GSR intake manifold's flange with the changes circled in red:
This is the top of the flange, which shows how the top studs clear and the end ear gets cut:
This shows the coolant passage. I used a smaller drill bit, but didn't bother grinding all that material out:
This pic shows the mods needed to clear the middle & upper nuts:
Activation will be best done via a GPO (general purpose output) with eCtune/Hondata/Neptune; I'm not sure if outputs work in Crome Gold.
IIRC "B19Coupe" did this to a built LS and said it had decent low/mid/high gains over a stock LS IM.
This will definately be better (cheaper, more usable power) than a short-runner aftermarket manifold for most street/strip non-vtec builds.
Most people complain aftermarket IM's loose too much low/mid to justify the small top-end gains.
I really don't care how it will perform, since I'll be going with a m62 JRSC not long after.
It's currently colder than a witch's tittie outside, so I probably won't get this fitted onto the motor for a while anyways.
Mods, move this to any subforum you think is best.
I tried this because I'm putting a JRSC originally for a GSR on my LS after I fix the blower.
I just wanted to make sure redrilling an IM flange can work.
The JRSC manifold has enough meat for all head designs (itr/gsr/ls), so that should be easier.
It ended up being very simple, aside from tapping the head's EGR port deep enough for a 3/8" flush plug.
In WI we have heads with the port, but no EGR components. (FYI you need to tap at a slight angle, away from the cam seal.)
The rest was just some mild drilling & grinding on the flange for the different stud locations.
One key part is the intake gasket. The shape of the OEM LS & GSR gaskets don't work with the coolant/egr port differences,
but a Hondata/clone phenolic gasket for a B18B1 makes it work. If you really want to go wild,
you can port-match the wider IM runner to the head.
Here is a cheap P2R gasket for a B18B1 over the modded GSR intake manifold:
Here is the GSR intake manifold's flange with the changes circled in red:
This is the top of the flange, which shows how the top studs clear and the end ear gets cut:
This shows the coolant passage. I used a smaller drill bit, but didn't bother grinding all that material out:
This pic shows the mods needed to clear the middle & upper nuts:
Activation will be best done via a GPO (general purpose output) with eCtune/Hondata/Neptune; I'm not sure if outputs work in Crome Gold.
IIRC "B19Coupe" did this to a built LS and said it had decent low/mid/high gains over a stock LS IM.
This will definately be better (cheaper, more usable power) than a short-runner aftermarket manifold for most street/strip non-vtec builds.
Most people complain aftermarket IM's loose too much low/mid to justify the small top-end gains.
I really don't care how it will perform, since I'll be going with a m62 JRSC not long after.
It's currently colder than a witch's tittie outside, so I probably won't get this fitted onto the motor for a while anyways.
#2
Honda-Tech Member
Re: How To: B18C1 intake manifold onto B18B1
I have been wondering why more people didn't do this on B20's. It seems like it would produce a very usable power band. It certainly would be more ideal than a manifold designed for an ITR. Especially on a B20 since the bottom end and the restrictive head flow keep it from revving high enough to use the high rpm flow of the ITR style.
#3
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Re: How To: B18C1 intake manifold onto B18B1
I've always wanted to check the feasibility of this but haven't had a P72 manifold laying around for like 15 years. Really wish you had the time to do some tuning with both so we could see the results.
#4
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Re: How To: B18C1 intake manifold onto B18B1
I'm in the same boat pulled off my GSR Mani in like 02 for a blox. It's one of the few b-series parts I still have laying around. I'm about to get a jdm b20 tho, and I plan on putting it to use.
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Re: How To: B18C1 intake manifold onto B18B1
Manifold Comparison
endyn has a great write up on this from a looooong time ago.
loads more info on his site also
endyn has a great write up on this from a looooong time ago.
loads more info on his site also
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