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The Rb25de Head Reco/port/polish Pics.

Cubes

By Cubes,
in Engines & Forced Induction

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Cubes Grand Master

Cubes

Posted
Posted

I've recently had a RB25DE head rebuilt, ported and polished.

He didn't polish the Intake ports up much as its best to leave them a little rough.

He also did few other little bits inc. removing some material around the valves in order to help the gas enter/leave the comb chamber.

I wonder if it will lower the compression?!?

I've made the pics smaller they are around 50kb each.

Chris Milton Engineering concentrated on the exhaust ports so when I get some decent pics of the exhaust ports I'll post em'.

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mambastu Collaborator

mambastu

Posted
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I'll be interested to see the exhaust ports :P

I've just ported my RB25DET head but apart from a bit of smoothing and polishing I left the the combustion chambers alone. I wonder how much benefit there is from de-shrouding the valves ?

Cubes Grand Master

Cubes

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They checked out the std valves and said they were in perfect condition so they didn't replace them. He said there was no wear on the valve stem.

It was worth just under $900. Chris had the best price and the most experience with these heads. I gave Adelaide Engine Developments a buzz and with slightly less work done they wanted $1100.

Bl4ck32 also had his head done at the same time so I guess it was a bit of a bulk job.

The head will be going on a 3ltr bottom end soon :P

Cubes Grand Master

Cubes

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Yer it was Freebaggin...

You are blowing heaps and heaps of black smoke...

You pulled out of the corner near lonsdale?

I was hoping you were going to give it some stick as I was in the mood, I had just ate a old VH V8 thing with stally that chiped third gear.

I was sitting at the lights behind him he was like laughing with this big smirk probably thinking haha your going to get your arse kicked .

He then stalled it up with his stally but wheel spun through first, he chirp second, I had to short shift second then pinned third pulled out and over took rather quickly with his reving in my ear I clicked fourth and then pulled in front. :P Good ol' RB's and 16psi.

He had a "Only wine comes in 2ltrs" blue sticker on the back window. It was pretty slow for how it idled (rather lumpy) and the stally and gear chirps i.e 2nd and 3rd.

Cubes Grand Master

Cubes

Posted
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Posted

Meggala,

At first I'm going to keep using the stock box until it dies.

It should be ok as the traction won't be there hence tyre width.

I'm going to keep running the 225 50's until I get the RB25DET box in there. Until then.. it will be wheel spin in 4th.. :P

Maybe.. Don't really know but should be fun anyhow.

I'm also going to keep the HD 30% Organic clutch. That will most probably die before the gearbox.

I'm also ditching the Chrome Molly Flywheel and am going to go a balanced std. RB25DET item. I'd rather have the heavier weight of a stock flywheel to absorb the vibrations + the RB20DET clutches are slightly smaller than the RB25DET. I think.. ;)

Freebaggin Proficient

Freebaggin

Posted
Posted

Yep, it's a rich mixture but has the power so I don't mind, Tim and Shaun's doing.

Good to see you blew that git away! Only have 2 points left on license so have to take it easy for a while.

Good luck with 3L!

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