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R33 Head Modification And Running In Question

33turbo

By 33turbo,
in Engines & Forced Induction

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33turbo Newbie

33turbo

Posted
Posted

Ok first post so i'll make this quick,

When welding or grub screwing the vct oil feed shut on the R33 head and making up an external oil feed for the vct, can i use an rb30 headgasket and put it together using the rb25 head bolts?
Then put it all back together then good to go?
My reason for asking is because in this guide he shows in the second or third photo a bit that has been welded on for seating the rb25 head gasket?

http://homepages.vodafone.co.nz/~lakewood/Skyline/R33_head.htm

Is there any benefits using the 25 gasket?


Also with running the motor in, is it best to drive it softly for 1000ks (or whatever is recommended) with mineral oil then dyno tune it or tow it and chuck it straight on the dyno?

If driving it for 1000ks i will be using all the stock bolt ons rather than the upgraded items

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

I am using an RB25 head gasket. Run it in on the dyno - no softly softly stuff (assuming tuner will not thrash it to death). Then dump oil and refill and drive normally watching oil pressure and temps and checking for leaks.

Ok first post so i'll make this quick,

When welding or grub screwing the vct oil feed shut on the R33 head and making up an external oil feed for the vct, can i use an rb30 headgasket and put it together using the rb25 head bolts?
Then put it all back together then good to go?
My reason for asking is because in this guide he shows in the second or third photo a bit that has been welded on for seating the rb25 head gasket?

http://homepages.vodafone.co.nz/~lakewood/Skyline/R33_head.htm

Is there any benefits using the 25 gasket?


Also with running the motor in, is it best to drive it softly for 1000ks (or whatever is recommended) with mineral oil then dyno tune it or tow it and chuck it straight on the dyno?

If driving it for 1000ks i will be using all the stock bolt ons rather than the upgraded items

Ben C34 Grand Master

Ben C34

Posted
Posted

I am using an RB25 head gasket. Run it in on the dyno - no softly softly stuff (assuming tuner will not thrash it to death). Then dump oil and refill and drive normally watching oil pressure and temps and checking for leaks.

did you weld the block for more sealing surface in that coolant gallery or is it not as bad as it looks in that photo?

Shoota_77 Veteran

Shoota_77

Posted
Posted

In regards to the break in procedure I've always believed in this guys procedure-

http://www.mototuneusa.com/break_in_secrets.htm

Makes a lot of sense to do it that way. Seems a little heavy handed but he's done a lot of research to show that it works.

Piggaz Grand Master

Piggaz

Posted
Posted

^^

Yep. Start, check for leaks. None? Sweet! Get on the dyno and load it up. Gave it back to me and went belting through the hills. 3rd and 4th gear pulls up hills to 6500 rpm. 3 days later at the last years nationals, Wakefield park and airport runs.

Basically gave it as much load as I could give it from as early as possible.

Last engine was run in very similar. Never breathed a drop of oil.

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Running in as per Piggaz's post above has been the correct procedure for at least the last 30 - 40 years (on dyno or road) - anyone telling you to take it "softly" is way out of touch.

http://www.mototuneusa.com/break_in_secrets.htm

Anyone ever done this ^

Im going to be running one in soon the old 1000ks softly way but that kinda looks to me like i better have a spare 30 block just incase haha

StevenCJR31 Veteran

StevenCJR31

Posted
Posted

Ok first post so i'll make this quick,

When welding or grub screwing the vct oil feed shut on the R33 head and making up an external oil feed for the vct, can i use an rb30 headgasket and put it together using the rb25 head bolts?

Then put it all back together then good to go?

My reason for asking is because in this guide he shows in the second or third photo a bit that has been welded on for seating the rb25 head gasket?

http://homepages.vodafone.co.nz/~lakewood/Skyline/R33_head.htm

Is there any benefits using the 25 gasket?

Also with running the motor in, is it best to drive it softly for 1000ks (or whatever is recommended) with mineral oil then dyno tune it or tow it and chuck it straight on the dyno?

If driving it for 1000ks i will be using all the stock bolt ons rather than the upgraded items

StevenCJR31 Veteran

StevenCJR31

Posted
Posted

Ok first post so i'll make this quick,

When welding or grub screwing the vct oil feed shut on the R33 head and making up an external oil feed for the vct, can i use an rb30 headgasket and put it together using the rb25 head bolts?

Then put it all back together then good to go?

My reason for asking is because in this guide he shows in the second or third photo a bit that has been welded on for seating the rb25 head gasket?

http://homepages.vodafone.co.nz/~lakewood/Skyline/R33_head.htm

Is there any benefits using the 25 gasket?

Also with running the motor in, is it best to drive it softly for 1000ks (or whatever is recommended) with mineral oil then dyno tune it or tow it and chuck it straight on the dyno?

If driving it for 1000ks i will be using all the stock bolt ons rather than the upgraded items

go for an internal vct feed and use NEW rb25head bolts

nicr4wks Experienced

nicr4wks

Posted
Posted

go for an internal vct feed and use NEW rb25head bolts

I've heard mixed things about this method, mainly that it has the possibility of starving other components when the pressure is required for VCT? It sure would be a tidier method, anyone with experience on this have some input?

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