Frayz's little tuning update..
Thread Starter
Joined: Sep 2005
Posts: 19,945
Likes: 2
From: "Engineering Perfection in Essex"
Well i guess id better give you guys something to look at, for those that havent died of boredom waiting for me.
On friday i picked up a set of JDM Version 8 AVCS heads. These were in good condition on the whole but very very dirty. Dirt aside i could see that they were in good shape and complete with cams, buckets and valvetrain.
So last night i started work on the LH head. This was given a basic cleanup and inspection. The RH one will be done when i next get a free moment. Once happy, i will fully strip both heads ready for some machining before being rebuilt with new seals etc.
Sorry for the phone pics, my cameras been on loan, lol.
Here they are when i picked them up.





Heres the LH head after a little jolly up.




On friday i picked up a set of JDM Version 8 AVCS heads. These were in good condition on the whole but very very dirty. Dirt aside i could see that they were in good shape and complete with cams, buckets and valvetrain.
So last night i started work on the LH head. This was given a basic cleanup and inspection. The RH one will be done when i next get a free moment. Once happy, i will fully strip both heads ready for some machining before being rebuilt with new seals etc.
Sorry for the phone pics, my cameras been on loan, lol.
Here they are when i picked them up.





Heres the LH head after a little jolly up.




Thread Starter
Joined: Sep 2005
Posts: 19,945
Likes: 2
From: "Engineering Perfection in Essex"
Been to see my machinist today to discuss some custom work to both my block and heads.
The block will be strengthened and the heads will have the combustion chambers altered to suit the larger 99.5mm bore of the 2.5.
I have specified the machining to give the correct cc volumes for my CR whilst maintaining good quench area.
I have also come up with an idea to prevent the common failure of the stock heads cracking. I'm not 100% sure it will all work as expected. But I've done the maths, so we shall see.
The heads will be stripped of valvetrain tonight and we'll get the ball rolling.
Should be fun :-)
The block will be strengthened and the heads will have the combustion chambers altered to suit the larger 99.5mm bore of the 2.5.
I have specified the machining to give the correct cc volumes for my CR whilst maintaining good quench area.
I have also come up with an idea to prevent the common failure of the stock heads cracking. I'm not 100% sure it will all work as expected. But I've done the maths, so we shall see.
The heads will be stripped of valvetrain tonight and we'll get the ball rolling.
Should be fun :-)
Be careful my loved up friend, there could be a real danger that if you carry on in the present vein you may get beyond just talking and actually make some progress on your car.
Thread Starter
Joined: Sep 2005
Posts: 19,945
Likes: 2
From: "Engineering Perfection in Essex"
Heads have now been CC checked in stock form. If anyones interested, stock V8 JDM heads are 49cc.
They have been stripped of valvetrain. All parts have been inspected, cleaned, numbered and bagged for rebuild.
The heads are now having another hot wash before machining.
They have been stripped of valvetrain. All parts have been inspected, cleaned, numbered and bagged for rebuild.
The heads are now having another hot wash before machining.
Thread Starter
Joined: Sep 2005
Posts: 19,945
Likes: 2
From: "Engineering Perfection in Essex"
Heads have now been CC checked in stock form. If anyones interested, stock V8 JDM heads are 49cc.
They have been stripped of valvetrain. All parts have been inspected, cleaned, numbered and bagged for rebuild.
The heads are now having another hot wash before machining.
They have been stripped of valvetrain. All parts have been inspected, cleaned, numbered and bagged for rebuild.
The heads are now having another hot wash before machining.






- nice work

