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Max Cam Lift Before Grind

NRB26

By NRB26,
in Engines & Forced Induction

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NRB26 Enthusiast

NRB26

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Have done a little research and I'm still unsure what the max lift is before you have to grind the lifter walls. Some say 9.15. Some say 9.5. I'd like to know what size cams people have fitted without grinding the head. Are there differences in rb26 heads? The guy that sold me the cams assured me that they were straight drop in.

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NRB26 Enthusiast

NRB26

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Some photos of the cams I tried to fit. Wound the engine over by hand and it locked up. Only 9.25mm lift. 32mm base circle and 41.25mm lobe. This was only the exhaust side that I had an issue. Inlet spins freely. Ground lifter walls down to clear lobe. Now OK :)

Has anyone seen this before?

post-61828-0-05479200-1299063525_thumb.jpg

post-61828-0-92709400-1299063805_thumb.jpg

post-61828-0-67234600-1299063871_thumb.jpg

post-61828-0-48482100-1299063929_thumb.jpg

post-61828-0-15700300-1299064104_thumb.jpg

The Dan Grand Master

The Dan

Posted
Posted

Some photos of the cams I tried to fit. Wound the engine over by hand and it locked up. Only 9.25mm lift. 32mm base circle and 41.25mm lobe. This was only the exhaust side that I had an issue. Inlet spins freely. Ground lifter walls down to clear lobe. Now OK :)

Has anyone seen this before?

Yes, that's because you are using 32 base circle. You need to use reduced base circle for anything over 9.1

The Dan Grand Master

The Dan

Posted
Posted

Would that still be considered as "drop in" camshaft?

That depends on who makes the camshaft and what they specify it to be.

But anything different than a step1 or type1 for most manufacturers would be considered modified. I don't think any of them do a 9.25 step 1. I'm guessing it's a Tomei?, if that is the case, then 9.15 is the highest 'drop in' they do from memory

Although not sure Tomei even do a 9.25 and cbf looking

djr81 Grand Master

djr81

Posted
Posted (edited)

That depends on who makes the camshaft and what they specify it to be.

But anything different than a step1 or type1 for most manufacturers would be considered modified. I don't think any of them do a 9.25 step 1. I'm guessing it's a Tomei?, if that is the case, then 9.15 is the highest 'drop in' they do from memory

Although not sure Tomei even do a 9.25 and cbf looking

Yeah they do - 256 degree 9.25 lift inlet & exhaust.

Base circle is 32mm.

Edited by djr81
  • 7 years later...

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