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Rb25 neo bottom end rebuild

vxsr33

By vxsr33,
in Engines & Forced Induction

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AngryRB Grand Master

AngryRB

Posted
Posted
47 minutes ago, WMDC35 said:

Ports are the same, seems strange they'd bother to make the head/ports different but then use the same gasket?

Yeah i think your right, just looking at the pics i have, must of been drinking some beer that day, neo is smaller but i dont think you need to bother port matching, the head ports are just a bit larger than the runners.

AngryRB Grand Master

AngryRB

Posted
Posted

Top manifold is neo, bottom is R33

large.579ef8bdceaf4_20150602_151013(800x450).jpg

Neo runner, can see gasket doesn't fit perfectly, its slightly smaller than the gasket and around the injector is a lump.

large.20150602_151706.jpg

Same gasket on R33 runner shows its a better match, bigger runners and no lump at the injector position which probably doesnt matter.

large.20150602_151550.jpg

same gasket on the Neo head , so the neo head hasn't changed to be identical to the runners, seems to have continued same as R33 at that point.

large.20150602_151413.jpg

vxsr33 Proficient

vxsr33

Posted
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Posted

Ok, i comp tested my r33 today and here are the results.

I tested with all plugs out at once (not sure if this is right) and throttle body open. Keep in mind that i am using a cheap ebay comp tester so results may not be accurate. Car was warmed up idling for around 5 mins.

9907ad1fdf360e057af815cb884164db.jpg

i know they are not the best results, but far better than no compression in cyl one that i was told.

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