Jump to content
SAU Community

Tomei Head Gasket Questions

JustinP

By JustinP,
in Engines & Forced Induction

 Share

Recommended Posts

JustinP Mentor

JustinP

Posted
Posted

A couple of quick questions :)

1) Is the RB25DET (R33) Tomei head gasket OK to use on an R34 Neo engine?

2) Is is definitely OK to use a 87mm bore head gasket on a 86.5mm bore engine? I guess this will drop the compression ration slightly.

3) Does the Tomei head gasket come with a oil restrictor, and what size is it?

Thank you!!!!

Link to comment
https://www.sau.com.au/forums/topic/368361-tomei-head-gasket-questions/
Share on other sites
The Dan Grand Master

The Dan

Posted
Posted

1. Yes

2. Definitely ok

3. I have never ever seen a restrictor come with a gasket and I have bought dozens. But the Tomei Oil Gallery Orifice is 1.5mm as stated above. Refer to the forced induction section for restrictor sizing depending on application and pump being used

Beer Baron Grand Master

Beer Baron

Posted
Posted

1. Yes

2. Definitely ok

3. I have never ever seen a restrictor come with a gasket and I have bought dozens. But the Tomei Oil Gallery Orifice is 1.5mm as stated above. Refer to the forced induction section for restrictor sizing depending on application and pump being used

1, I concur.

2. yes, doctor, I concur.

3. yet again, I concur. the restrictor orifice only comes in the tomei full gasket kits (ie the ones that come with MLS head gasket, exhaust gaskets, inlet gaskets etc. they include the oil feed restrictor. but if you just buy a head gasket on it's own, all you get is head gasket. need to buy a restrictor separately.

JustinP Mentor

JustinP

Posted
  • Author
Posted

Thanks to everyone for the quick replies :)

I will source the restrictor separately.

1, I concur.

2. yes, doctor, I concur.

3. yet again, I concur. the restrictor orifice only comes in the tomei full gasket kits (ie the ones that come with MLS head gasket, exhaust gaskets, inlet gaskets etc. they include the oil feed restrictor. but if you just buy a head gasket on it's own, all you get is head gasket. need to buy a restrictor separately.

JustinP Mentor

JustinP

Posted
  • Author
Posted

Arrgh one more question....

I presume the Tomei 1.5mm oil restrictors for the RB26DETT will also suit a RB25DET Neo??

Thanks :whistling:

Thanks to everyone for the quick replies :)

I will source the restrictor separately.

SargeRX8 Grand Master

SargeRX8

Posted
Posted

I'm just asking a noob question but why do you need the restrictor? Is this due to the head gasket change or something else? I thought you change the restrictor if you upgrade oil pump to maintain same flow in oil around the engine... Also noticed many different thicknesses for headgaskets. Does increasing the headgasket size increase bore capacity by that little tiny bit thus requiring a tweak up of the tune?

I'm not nit picking, I genuinely don't know.

Beer Baron Grand Master

Beer Baron

Posted
Posted

the oil feed restrictors are a good idea even with stock oil pumps. especially if your engine is going to see a lot of sustained high RPM use. as kiwi said even a stock oil pump running and long periods of high rpm will flood the head with oil.

as far as thicker head gaskets go they don't increase the bore diameter. they do slightly increase chamber volume which reduces squish and reduces compression ratio. you need to ensure you know what you're doing when chosing head gasket thickness so you get the characteristics you want.

Ramius83 Collaborator

Ramius83

Posted
Posted (edited)

I have actually just bought two Tomei 87mm bore 1.2mm thick RB26 head gaskets and both came with the Tomei 1.5m oil restrictor in the bag. Both head gaskets were bought about 6 months apart and came from two different vendors.

Edited by Ramius83
JustinP Mentor

JustinP

Posted
  • Author
Posted

Damnit!!! I just bought the head gasket and the restrictors separately.... And wasted $21 in the process... Nooooooo!! :)

I have actually just bought two Tomei 87mm bore 1.2mm thick RB26 head gaskets and both came with the Tomei 1.5m oil restrictor in the bag. Both head gaskets were bought about 6 months apart and came from two different vendors.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • MBS206
      NC MX5

      By MBS206 · Posted

      Nah, they'll do it without a receipt, tell em roughly when it was, that it was cash, youll likely only get store credit, but that gets you some dollars towards the newer better shovel, or other item you need/want later.   Still take it back and have a crack at returning it.
    • GTSBoy
      Mistakes were made, my R34 Story

      By GTSBoy · Posted

      Nah. Was just wondering if you were having a small stroke or if there was some slur/gaf/inside joke that I wasn't aware of.
    • MBS206
      Mistakes were made, my R34 Story

      By MBS206 · Posted

      That was a fark up, it's Salamanca Place I was thinking of. And now I'm curious as to what potential slur/gaf I have caused with Salamander Road, ha ha!
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      Actually everyone on the roads was really well behaved. The only person that did any minor tailgating was a local hoon in a Turbo Focus. Unfortunately we weren't going the same way so there was no grand initial D touge battle. Lots of people pulled over and let me through. The amount of "Hey man nice car, omg skyline, nice 34 man woo" was suprising. Like really suprising. Like almost annoying. My partner was obviously surprised, she'd never seen anyone in the real world point out the car/like the car/want to chat about the car before, so to have like 3 people per day mention it was notable, I could finally say SEE? SOMEONE THINKS THEY'RE COOL. Everyone was also pretty suprised about the weather. Every day was dry and about ~13-14C. Mount Wellington had a sign that said they close the gates at 9pm and I was heading up there at about ~7:30. It was VERY apparent that conditions were getting significantly worse by the minute on the way up and down. The road on the mountain was terrible though, it's no driving road. I have various suspension related questions now. Luckily it was only about 20 minutes from where we were staying to the top of the mountain as said Google maps. We only had the 2 nights in Hobart. We went to the Farm Gate Market though which was really good - And went down to the Hastings Thermal springs/caves down there during the day. I'd definitely be up for going back again, so luckily there's a few more sights yet to see. Didn't get to do the west coast/queenstown/cradle mountain so this was supposed to be a 'scouting' trip anyway of sorts if I were to one day do/take part in/organize a more car-focused trip. As for the boat, it wasn't bad. Well it was bad, but not in the way you're thinking. We did the night trip which leaves at 6:45 (though you have to be there ~2 hours earlier) and arrives the next morning at about 6am. There is nothing to do on the ship. If you plan accordingly and bring a book/tablet/show to watch/charger you can just chill out, take some Travacalm and just sleep through it. The food there is an extremely basic buffet that costs $32 a plate, or $14 for a $3 pizza. The way back we had a travel kettle and a few different types of cup noodles and made our own tea/coffee in the room. This was a far superior way to do it. At the very least book one of the rooms with beds. I guess as we were in the off season we didn't have room mates. You get an option for rooms with 4 beds (2x bunks) or a room with just the two bottom beds. There's also some option for a deluxe queen bed but it's much pricer. We've been on sleeper trains in Asia before so we figured this is similar (and it was)
    • GTSBoy
      Mistakes were made, my R34 Story

      By GTSBoy · Posted

      Was that deliberate?
×
×
  • Create New...