Mivec Owners Group

It is currently 24 Nov 2020 23:14

All times are UTC + 12 hours [ DST ]




Post new topic Reply to topic  [ 17 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: Degreeing cams
PostPosted: 19 Aug 2020 18:18 
Offline
Administrator
User avatar

Joined: 09 Dec 2003 10:18
Posts: 4440
Location: Hamilton
Country: New Zealand
I check in once a year or so ;)

_________________
93 Cyborg R (race car)

Waikato@Heart - supporting heart kids through life
Bart Dinger Electronics


Top
 Profile  
 
 Post subject: Re: Degreeing cams
PostPosted: 26 Aug 2020 01:39 
Offline
Mivec Guru

Joined: 04 Jul 2005 13:25
Posts: 1218
Location: Lower Hutt
Country: NZ
I check in once a year too.
You're still here?
Still mivecing?


Youtube is good, check out my latest



https://www.youtube.com/user/1magnit

nearly 100 videos, really short , can hit repeat a few times.


After doing lots and lots of measuring I can confirm that 6G72 mivec cams come in 2 different specs.
The spec I based this topic on are the ones running in the GTO since 2012 or so.
They're the same as the ones I measured in a complete mivec engine before stripping it.
I've got 2 other sets as well, both of those are the same as each other but different from those above. I haven't yet done a full measurement but they have more lift on every lobe.

I've built a stroker 3.35 litre mivec based on a 4 bolt gto TT block and modded 84 mm stroke 6G74 crank. Built to bolt into a gto. The bottom end is built, the heads are on with spacer plates, I've degreed and adjusted / modded the cams gears on it ........that's as far as I got when I found out my spares have more lift so that's it paused for now til I come up with a plan for the next stage.

In the meantime I've got a 6G74 Pajero block bored out to 95 mm for stock 6G75 pistons. I've also offset ground the 6G74 crank from 85.8 mm to 91 mm to make 3.9 litres using modded RB30 conrods. I've dummy assembled it over 20 times but not using the mivec heads on it, maybe later? BUT I've also offset ground a 6G75 crank from 90 to 95 mm and I'm looking at using that instead to give 4040 cc. That means more measuring and checking and at the same time I'll look at making the mivec heads fit, the limiting factor being length of the belt I'm using along with the block and the geometry of the tensioner components. The factory 3.5 mivec uses a different block from this one, I've got that variety too.

_________________
6G72 mivec Twin TDO5 20Gs up and running.
6G72 mivec bored and stroked to 3.4 litres...Frankenmitsi build
6G74 mivec bored and stroked to 3.9 litres....Frankenmitsi build.
6G75 under construction....4.2 litres bored and stroked.Another Frankenmitsi.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 17 posts ]  Go to page Previous  1, 2

All times are UTC + 12 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 11 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group