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RB 20/25/30 DET Skirmisur Conversion

Share and discuss mod ideas here that make your Isuzu safer, faster, more homely, more user friendly or just crazier! The best from here will be made into a full DIY write up for the FAQ and DIY mod section.

RB 20/25/30 DET Skirmisur Conversion

Postby 88bighorn » Mon Nov 08, 2010 6:01 pm

Hey There Folks
First time post on here an its a crazy one,
i currently own a 89 2door bighorn and its one wicked beast but there is a few problems with the old tired engine
For starters she blows oil out of her breather pipes and ive fixed this by installing a "catch tank" otherwise known as a poweraid bottle with a hole in it seems to be a problem with 2.8-t engines once that was all sorted out an i wasnt buying more oil every week i started making longish trips and getting a little more keen on off roadin down the river
yes... well its great but its just not crazy enough for me and the other side of this is i rather do like going fast as i have own a few normalish boyracer cars

but anyway down to the nuts an bolts of what i need to know i seen a few people have gone down the V6 route after driving a holden Gts im not so keen on this as its basicly not crazy enough im thinking of getting into the relm of Turbo Rbs ive searched the forum an it doesnt seem like anyone else has done this

now have a manual gearbox is it as simple as making up an adapter plate to mate the new block an engine mounts i understand the cert side of this idea as i have other mods i want to do at the time of conversion
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby pig75 » Mon Nov 08, 2010 6:15 pm

I think a V8 would be a easer swap than a straight 6. Check the length of a RB30
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby geeves » Mon Nov 08, 2010 7:57 pm

first
http://www.treadlightly.org.nz/
We have to promote responsible 4wding except in areas where it is safe and ok to do otherwise which is rarely somewhere public. You have other cars for hooning.
Now we've got the political correctness done onto the problem.
You can make an adapter plate to join the nissan engine to the isuzu gearbox but its a lot harder than drilling a few holes in some 10mm steel. If the gearbox and engine centers are out by 100th mm you clutch will be stuffed in 10km. If i was doing this I would use the nissan box as well and mate it to a hilux transfer case. Another possibility is a terrano gearbox.
Why not go all out and go LS1 350cubic inches all alloy. Maybe add a blower on top
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby geeves » Mon Nov 08, 2010 7:59 pm

the nissan engine might not be that silly. The early jackeroos had an option of the holden 186 engine. These are the same as the early bighorns
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby 88bighorn » Mon Nov 08, 2010 8:00 pm

Soo i just went out a measured my Rb30e that i have spare its around 73-75 cant really get a great measurement as its sitting in a car and from the firewall to the forward most point in the truck its also 75 (thats if i took out the radiator ) so i could try fit it in moving the radiator further forward to where the Ac radiator is , the other option is a Vh4.1/4.5 that has the dimensions of 660mm long to the back of the R/h head 700-780mm from rocky cover to rocky cover and from a stock sump to the inlet manifold is 700mm
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby slightlydodgy » Tue Nov 09, 2010 5:59 am

I take it that bighorns have a bigger engine bay than mus and rodeos because I measured up for a holden straight 6 and a falcon 6 (I like my non jap sixes) and both are no go without major mods as the blocks from rear of block to front pulley are 760mm
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby geeves » Tue Nov 09, 2010 9:13 am

Never looked closly at it but the early jackeroo didnt have air con so radiator might be further forward and who knows if they took a sledge hammer to the firewall.
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby slightlydodgy » Tue Nov 09, 2010 4:56 pm

The front pulley would be under the bonnet latch on a mu/rodeo radiator on bullbar?
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby MUVIT » Tue Nov 09, 2010 9:09 pm

the mu and jackaroo must be like comparin a hb torana 2 a lc/lj
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby 88bighorn » Wed Nov 10, 2010 3:24 pm

So after a long day of hum and haring snaping a bolt in my manifold trying to blank out the EGR pipe so i could get under the rocker cover ive been thinking alot about a VG30 or the Vh 4.1 and making ITBs for either
now im after a dud gear box so i can start mocking up a adapter plate an make up a kind of jig ill dump some photos so you guys can put a face to a name if u seem me around town im rather keen to catch up with other off roadies
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby MARKx4 » Thu Nov 11, 2010 9:06 am

If you go a nissan V8 go the vh45 and use the nissan GQ auto. From memory they are the same gear box and it is easier to use the GQ auto then it is to install a GQ transfer to the infinty gearbox.

Have you considered the toyota 1uzfe instead? I dont know about NZ but they are alot easier to get parts for then the nissan V8 in aus.

Also another option is a toyota 3rz (2.7 petrol) engine out of a hilux, do a search as you can get alot of power out of them (some with turbo set ups with over 900hp) and if you go this route you will not have to worry about gearbox and transfer adaptors as you can use the hilux box and transfer case.

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Re: RB 20/25/30 DET Skirmisur Conversion

Postby muzila » Thu Nov 11, 2010 3:53 pm

Is the engine bay about the same size and shape of the MU? If So the 1UZ-FE probably won't fit. I have been doing research on them compaired to the 350 chev. The chev just fits and guess what the 1UZ-FE is 30 % larger. Lighter being alloy but quite a bit bigger.
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby 88bighorn » Thu Nov 11, 2010 4:37 pm

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Re: RB 20/25/30 DET Skirmisur Conversion

Postby MARKx4 » Thu Nov 11, 2010 4:55 pm

muzila wrote:Is the engine bay about the same size and shape of the MU? If So the 1UZ-FE probably won't fit. I have been doing research on them compaired to the 350 chev. The chev just fits and guess what the 1UZ-FE is 30 % larger. Lighter being alloy but quite a bit bigger.


If that is the case, the nissan V8 wont fit as it is even bigger again and you will have trouble with the VG30 as it is as wide as the V8 aswell.

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Re: RB 20/25/30 DET Skirmisur Conversion

Postby 88bighorn » Thu Nov 11, 2010 5:14 pm

[quote="MARKx4"]If you go a nissan V8 go the vh45 and use the nissan GQ auto. From memory they are the same gear box and it is easier to use the GQ auto then it is to install a GQ transfer to the infinty gearbox.

Have you considered the toyota 1uzfe instead? I dont know about NZ but they are alot easier to get parts for then the nissan V8 in aus.

Also another option is a toyota 3rz (2.7 petrol) engine out of a hilux, do a search as you can get alot of power out of them (some with turbo set ups with over 900hp) and if you go this route you will not have to worry about gearbox and transfer adaptors as you can use the hilux box and transfer case.

Thanks Mark that is a brilliant idea ive done some research about the 3rz engines and it seems like they make huge power 8-)
i cant find in much of a way to rebuild threads but thats cool if i went this way id idealy make a girdle for the bottem end find somone to do some head work then talk to frank from the one stop turbo shop out in waipara .. i laughed at my mate when he brought home a truck turbo but by the looks of it these 3rz can really breath neway thanks mark for the idea
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby 88bighorn » Thu Nov 11, 2010 6:57 pm

i had a look on trade me currently there arnt that many 3rz engines on there soo ill have to dig deeper to find one
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby MARKx4 » Fri Nov 12, 2010 10:30 am

have a look at write off vechile auctions, you may pic up a complete 2wd hilux with one in it complete on the cheap or you could look at jap imports for one aswell.

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Re: RB 20/25/30 DET Skirmisur Conversion

Postby 88bighorn » Sat Aug 06, 2011 10:10 am

Well then this is a bit shite my truck has some serious cancer in her so this project is a go now as i no longer need to keep it road worthy will start to update as i get along some of the things im going to do may very likely be a unsafe prototype any idea would be welcome also any parts that you may wany ie headlights etc im likely to sell since shes turning into a pure offroad
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby geeves » Sat Aug 06, 2011 10:58 am

Keep it looking legal and complete as much as possible. You never know when you might need to drive home on the road and dont want to attract attention.
Also things like lights come in very handy when the trip lasts longer than expected.

The first comment does not reflect the ideals of clubisuzu as it includes an invite to break the law Dont blame us if you get caught
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: RB 20/25/30 DET Skirmisur Conversion

Postby jellis » Mon Aug 22, 2011 5:00 pm

i wanted to put a 308 in mine but i spoke to an engineer to see wether it would be legal but because the motor was older than the car i would of had to run it on straight gas.
but seeing as its going to be offroad only go for it
make a template of the stuff you use tho as you might be able to make and sell a few kits.
cheers, Josh
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