Jump to content
SAU Community

Recommended Posts

To any body that can help...please....this is the driver talking so forgive me if my explanations are a little layman

Have just spent thousands converting the head to solid. From what I have been told the engineering has been done to accomodate mostly R34 GTR solid components. Included in the build were new cams, valves, springs, lifters, shims, guides etc etc. In other words nothing was meant to be dodgy.

Having completed the job, dynoed the car then out to the track the car immediately felt like it was towing a caravan....ended up finding that it had dropped the shims. Went back and re measured clearances and found a small amount of settling...went back to engineers who promptly tried to get bigger (thicker) shims to close the clearances. Shim supplier told them no way...you cannot install shims any thicker.

From what I am told the lifter and cam combination makes the lifter go too far down past the oil squirters wherever they are and the caps cannot hold the thick shims.

So far the only fix I have been given is to reduce the revs from 8200 down to who knows. As you can imagine...this does not please me as I was able to run the same revs with normal head in the past.

Can anybody assist who has problem solved this before....one other fix suggested was to have custom made caps built to accommodate the thicker shims and hold them more securely....all other people have said it has never been done before...and I find that hard to believe.

Any help greatly appreciated

Thanks

Thanks so far every one

To the best of my knowledge the shims have ended up around 25 thou but I will have to check.

I had already heard that Tomei did supply something different (We have the Tomei product installed) and were then told another version existed...however after waiting 4 weeks the same product has arrived and now I am told it is the only one available.

Does that give you any more to work with?

If I can I will try and give you part numbers later tomorrow.

Thanks so far

i know john hill of jhh engineering in qld has done quite a heap of solid conversions and he's had no drama's.

i think the tomei springs are no longer made but the lifters are, and u cant use 1 without the other

your in a bit of a pickel, one that your gonna ahve to sort out with whoever did the conversion

i know john hill of jhh engineering in qld has done quite a heap of solid conversions and he's had no drama's.

i think the tomei springs are no longer made but the lifters are, and u cant use 1 without the other

your in a bit of a pickel, one that your gonna ahve to sort out with whoever did the conversion

You are right ....bit of a pickle is an understatement....all of a sudden the engineers and the workshop are starting to use terms like ....."oh this is R&D work" reading between the lines it is looking like the 12 / 20 warranty (12 seconds or 20 metres).

So far I am trying to keep it civil by trying to find possible solutions that I believe they will act upon...fingers crossed.

I will pass on the contact as a starting point....thankyou

i think the tomei springs are no longer made but the lifters are, and u cant use 1 without the other

im using the tomei lifter buckets with JUN springs...see's 9500 evertime i drive it...no problem.

we had the same problems running out of shim (thickest shim was not secure at high rpm) and switched to the tomei buckets and no problemo.

im using the tomei lifter buckets with JUN springs...see's 9500 evertime i drive it...no problem.

we had the same problems running out of shim (thickest shim was not secure at high rpm) and switched to the tomei buckets and no problemo.

out of curosity with solid lifters can you run rb26 cams that were designed for solid lifter applications ? and if u can what about vct functality, i dont have the need to rev high yet but if i ever get a turbo that works in a high rpm effeciency range, i would like to have an idea where i stand

im using the tomei lifter buckets with JUN springs...see's 9500 evertime i drive it...no problem.

we had the same problems running out of shim (thickest shim was not secure at high rpm) and switched to the tomei buckets and no problemo.

arent you using a 26 head though paul?

what i meant was the tomei solid lifter conversion kit for the rb25

Sounds like a RB26 head would have been easier however the RB25 motor and head combination was producing most of the goods really really well and in fact better than a similar RB26 motor.

All I was trying to do was to gain some additional reliability (given that the bottom end was very well built and at the time the head was pretty standard with the exception of cams), couple of hundred extra revs and whilst doing the head revision change cams to bring power on just a bit earlier.

Any other ideas that I can pass on greatly appreciated....I am starting to lose my passion for motorsport at the moment

Further update

From what I have been told now is that the Intake side is perfect running about a 1.7 mm shim but the exhaust side currently has a shim around 4.6 mm.

The head is using the Tomei 270 Pro Cams and Tomei "valve lifter set" (buckets) part number 163005.

From what we have discussed it seems that we need to find an alternative bucket (??Jun??) to suit the low base circle cam.

It was mentioned that Croyden Motorsport? may be able to help but I cannot find the number.

The only other alternative mentioned so far was to pull the head off and re cut the exhaust valve seats to lower the valve.

Any further ideas or sources of supply greatly appreciated

Regards

Further update

From what I have been told now is that the Intake side is perfect running about a 1.7 mm shim but the exhaust side currently has a shim around 4.6 mm.

The head is using the Tomei 270 Pro Cams and Tomei "valve lifter set" (buckets) part number 163005.

From what we have discussed it seems that we need to find an alternative bucket (??Jun??) to suit the low base circle cam.

It was mentioned that Croyden Motorsport? may be able to help but I cannot find the number.

The only other alternative mentioned so far was to pull the head off and re cut the exhaust valve seats to lower the valve.

Any further ideas or sources of supply greatly appreciated

Regards

Tomei make a bucket...contact Hi Octane Racing and have a chat to Ian. Let him know the base circle cam have and the shims you are currently using that way the correct set of "thicker" buckets can be ordered so that you dont have to "overshim" it.

Thanks again

I have passed the info on to the workshop and having it all followed up. Certainly looks like there is a reasonably simple fix only problem is when talking with High Octane they swear there is only one bucket available and every body else says there are at least two.

I spoke with someone at Croydon Racing (did not get the name) but he was very helpful.

Fingers crossed the thing will be fixed shortly.

Thanks again

I have passed the info on to the workshop and having it all followed up. Certainly looks like there is a reasonably simple fix only problem is when talking with High Octane they swear there is only one bucket available and every body else says there are at least two.

I spoke with someone at Croydon Racing (did not get the name) but he was very helpful.

Fingers crossed the thing will be fixed shortly.

Yes well Croydons tried 2 different buckets on mine...so their are definately different types. Im sure the thicker ones we ended up going with were Tomei and im sure we sourced them from Hi Octane. Weird

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Hi all,   long time listener, first time caller   i was wondering if anyone can help me identify a transistor on the climate control unit board that decided to fry itself   I've circled it in the attached photo   any help would be appreciated
    • I mean, I got two VASS engineers to refuse to cert my own coilovers stating those very laws. Appendix B makes it pretty clear what it considers 'Variable Suspension' to be. In my lived experience they can't certify something that isn't actually in the list as something that requires certification. In the VASS engineering checklist they have to complete (LS3/NCOP11) and sign on there is nothing there. All the references inside NCOP11 state that if it's variable by the driver that height needs to maintain 100mm while the car is in motion. It states the car is lowered lowering blocks and other types of things are acceptable. Dialling out a shock is about as 'user adjustable' as changing any other suspension component lol. I wanted to have it signed off to dissuade HWP and RWC testers to state the suspension is legal to avoid having this discussion with them. The real problem is that Police and RWC/Pink/Blue slip people will say it needs engineering, and the engineers will state it doesn't need engineering. It is hugely irritating when aforementioned people get all "i know the rules mate feck off" when they don't, and the actual engineers are pleasant as all hell and do know the rules. Cars failing RWC for things that aren't listed in the RWC requirements is another thing here entirely!
    • I don't. I mean, mine's not a GTR, but it is a 32 with a lot of GTR stuff on it. But regardless, I typically buy from local suppliers. Getting stuff from Japan is seldom worth the pain. Buying from RHDJapan usually ends up in the final total of your basket being about double what you thought it would be, after all the bullshit fees and such are added on.
    • The hydrocarbon component of E10 can be shittier, and is in fact, shittier, than that used in normal 91RON fuel. That's because the octane boost provided by the ethanol allows them to use stuff that doesn't make the grade without the help. The 1c/L saving typically available on E10 is going to be massively overridden by the increased consumption caused by the ethanol and the crappier HC (ie the HCs will be less dense, meaning that there will definitely be less energy per unit volume than for more dense HCs). That is one of the reasons why P98 will return better fuel consumption than 91 does, even with the ignition timing completely fixed. There is more energy per unit volume because the HCs used in 98 are higher density than in the lawnmower fuel.
    • No, I'd suggest that that is the checklist for pneumatic/hydraulic adjustable systems. I would say, based on my years of reading and complying with Australian Standards and similar regulations, that the narrow interpretation of Clause 3.2 b would be the preferred/expected/intended one, by the author, and those using the standard. Wishful thinking need not apply.
×
×
  • Create New...