camshafts

ITR camshaft, valve train and B16a head rebuild

This entry is part 27 of 41 in the series TrackDays EF7 HONDA CRX

No big deal for my first ‘new headgasket’ ! STAGE-2 is a good opportunity again to use the full potential of the ‘HSPP’ (Honda Swapping Parts Possibilities ^^). Head will receive a pair of TYPE-R Integra 1998+ camshaft and a brand new set of double Brian-Crower springs.

B16a head rebuild

General view of the head removed and prepared for the machine shop.

B16a head rebuild

Everything’s removed except springs and valves to protect valve seats during machining.

B16a head rebuild

Aircraft carrier deck !

B16a head rebuild

And the whole head ready to go !

B16a head rebuild

With a few days off before the head comes back from the shop, I prepared the two most important tools for the job :

  • A spring compressor. No explanations needed I think … I choose a diesel injectors socket to have room for removing and installing valve keepers.
  • A shoebox (with drawings ^^) : you must be careful with your valves removal ! One valve has a place and only one on your head. If you put them back on it like me you SHOULD NOT change their respective place.

Each valve is ‘popped’ into the cardboard to store everything correctly. Same for the keepers.

B16a head rebuild

The head back from the shop. It was never machined before and I have plenty of ‘material’ on it for a future bigger preparation.

But as it is not the purpose this time, the shop removed the minimum amount of material with around 3/100 millimetres.

B16a head rebuild

The first removed valve. My homemade tool is not the easyest one to use but it’s ok.

B16a head rebuild

All valves on the shoebox. Remember to write its orientation (intake and exhaust side) because without appropriate markings, rotate the box 180° cw or ccw and you’re lost ^^ !

B16a head rebuild

Spring compressor.

B16a head rebuild

Nothing special here but I simply finished to remove old intake manifold seal and stuff like this.

B16a head rebuild

Removing old valves seal. If like me you don’t want to invest into the right tool here is how I did :

  • Take a pair of pliers and adjust it on a seal to check it.
  • Use a small gas burner
  • Simply heat a seal during 10 seconds (make tests ..)
  • Heating it helps melting the part and it’s really easy then to remove it with the pair of pliers.

B16a head rebuild

Shinny ready head.

B16a head rebuild

Valves side.

B16a head rebuild

Just after this picture I discovered that all runners were having sharp edges below valves seats. Even if doing a porting of the head is not the target, I decided to just smoothly remove those edges with a pneumatic tool.

It took time to work properly but at the end the difference is huge ! I’m sure this is a detail but it can been only positiv for airflow improvement.

B16a head rebuild

Valves break-in kit. There is a thick and fine grain break-in oil in it but only used the fine one.

B16a head rebuild

Job done on one valve. There is 15 more to do … ^^ !

B16a head rebuild

New OEM Honda valves seals for both intake and exhaust side.

B16a head rebuild

Installed.

B16a head rebuild

The other side of the head waiting for valves seals … and a preview of my upgrades.

B16a head rebuild

A brand new set of Brian Crower DOUBLE valve springs. When installing ITR camshafts you need to forget your simple springs as they can cause severe damages (floating valves) over 7800 RPM.

Double check everything : use a the wood back of a hammer to gently push the reassembled valves. Springs will move a little bit and you’ll check that all keepers stay in their places.

B16a head rebuild

One side done

B16a head rebuild

I also decided to install brand new TYPE-R Integra LMA (Lost Motion Assembly) to avoid floating problems with the VTEC center cam when VTEC is not engaged.

B16a head rebuild

Difference between LMAs : B16a on the left VS ITR on the right. ITR LMA springs are harder than on the B16a1.

B16a head rebuild

New small seals. These goes into oil VTEC runners on entry side of the head.

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Category: CarEngine and Transmission

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Article by: yogi