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Possible To Use Rb25/26 Engine Mounts With Rb20det?

ACEMANN

By ACEMANN,
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ACEMANN Contributor

ACEMANN

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Just wondering if anyone has had the opportunity to compare the RB20DET motor mounts with the ones from the 25/26 motors. Not just the rubber mounts (which from GTS-T to RB25/26 conversions seems to work) but the actual aluminum mounts that bolt to the block. From what I have "heard" the answer is "no" and I would tend to expect that much, but ANY insight would be appreciated. I just don't have the resources to look at this myself.

boot_it Enthusiast

boot_it

Posted
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Just wondering if anyone has had the opportunity to compare the RB20DET motor mounts with the ones from the 25/26 motors. Not just the rubber mounts (which from GTS-T to RB25/26 conversions seems to work) but the actual aluminum mounts that bolt to the block. From what I have "heard" the answer is "no" and I would tend to expect that much, but ANY insight would be appreciated. I just don't have the resources to look at this myself.

they will all interchange with each other as they all have the same block bolt patten

ACEMANN Contributor

ACEMANN

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they will all interchange with each other as they all have the same block bolt patten

Oh wow - thanks! I'm in the US and no one here could give me a straight answer. I have access to custom RB25/26 mounts for my project (RB in Z32) but not "specifically" for RB20. I'm sure the 25/26 mounts (aluminum structure) are somewhat different lengths than the 20 units, but as long as the 25/26 mounts can bolt to the 20 block (like you say they can) the differences in mounting position should be neglegeble. If anyone has a second opinion or has additional experience please feel free to add to this.

Thanks again!

Craved Grand Master

Craved

Posted
Posted

the Nissan Cefiro runs the RB20det and its engine mounts can be used on the the rb30's to drop the motor within the engine bay, so yes they all bolt onto the other blocks

so since its going into a 300zx, you'll be modifying the cross memeber to account for the new mounts?

ooohh your getting pre fabbed mounts specifically for this conversion - makes sense - but i beg to ask, how is this fabrication related?

ACEMANN Contributor

ACEMANN

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the Nissan Cefiro runs the RB20det and its engine mounts can be used on the the rb30's to drop the motor within the engine bay, so yes they all bolt onto the other blocks

so since its going into a 300zx, you'll be modifying the cross memeber to account for the new mounts?

ooohh your getting pre fabbed mounts specifically for this conversion - makes sense - but i beg to ask, how is this fabrication related?

I figured since I would be mentioning "custom mounts" and asking about swapping around motor mounts this would be the best place for the question.

I assumed that if the custom mounts for the Z32 are designed for an RB25/26, there might be issues with the length or angle of the RB20's aluminum mounts versus the RB25/26 aluminum mounts. If I can swap around the aluminum mounts from the various motors, then I might be able to get away with using the custom 25/26 Z32 mounts with the RB20 IF there is such a problem. Longitudinal placement could still be an issue - again I do not have the resources to investigate.

RB26's are terribly expensive, with 25's not too far behind. It would be nice to find an RB20 solution for the Z without the "premium" price tag. There are still logistical issues with finding 25/26 trans units and mounts - it really interests me since no one has even looked into it.

Yes the R25 or 26 offers more, but the RB20 is capable of decent power. Personal preference really..

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