big_l
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| posted on 17/2/10 at 07:45 PM |
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help with r1 4xv
hi guys . i have recently bought a unfinished mk indy kit car.
the car has had the chasis modified slightly .the passenger foot well is shorter and the engine is mounted further back for better weight balance
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its got mountings in place for a 4XV R1 ENGINE ..
i have herd mixed things about the 4xv but none of them are first hand!!!!
have any of you guys used a 4xv r1 lump and what was your experinces
cheers leon
Check out my blog  mnrvortxhayabusa@blogspot.com
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locoboy
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| posted on 17/2/10 at 08:23 PM |
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I had one, easy to install and plenty of power too.
Sounds great too.
Lots of info on here if you search, usefull if your stuck with wiring etc etc.
You wont be dissapointed.
ATB
Locoboy
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yorkshire-engines
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| posted on 17/2/10 at 08:27 PM |
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use a later 5JJ motor they have a better gearbox
cheers malc
ps i aint got one
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001Ben
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| posted on 17/2/10 at 08:53 PM |
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i have the 5jj engine, sweet as.
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big_l
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| posted on 17/2/10 at 09:14 PM |
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thanks for the replies guys
loco boy so how strong is the 4xv if its not going to take a little stick then that worries me ..
how much can the gearbox cope with ???
i have been told the 5jj has a stronger gearbox so ill fit one when the 4xv lets go...lol
Check out my blog mnrvortxhayabusa@blogspot.com
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dazzx10r
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| posted on 17/2/10 at 09:28 PM |
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4xv gearbox has a weak 1st &2nd gear, it's down to the selector fork bending and sometimes the 2nd gear can let go. 5jj models had a
re-designed gearbox with a taller 1st gear (to calm the wheely prone nature of the bike) The 5jj engine is exactly the same to look at as the earier
4xv and use's the same engine mountings, fit a good quality aftermarket timing chain tensioner, the std one can fail at high revs, usually by
over reving the engine going down the gearbox too fast. Mine let go at Nogaro circiuit when I was doing some winter testing, resulting in 12 bent
valves!
[Edited on 17/2/10 by dazzx10r]
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big_l
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| posted on 17/2/10 at 09:56 PM |
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when 2nd gear goes does it damage the casings. and is it easy to fix ..
also will 4xv carbs fit the 5jj
cheers
Check out my blog mnrvortxhayabusa@blogspot.com
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locoR1
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| posted on 17/2/10 at 10:04 PM |
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Had a 4xv in my car for around five years now first two years as a standard engine last three turbocharged made 257hp on its only dyno run thats a
standard 99 engine with just a cometic 1.6mm headgasket fitted, its never let me down yet so i would have to say don't be frightened off by all
the story's on weak gearboxes ect.
 
Description
Check out my CB500T Cafe Racer build diary
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big_l
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| posted on 17/2/10 at 10:08 PM |
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cool i have see you have been down santa pod
what time did it do and what state of tune was it at then ...
also how would you describe your driving style ?
how many mile had your engine done when you fitted it and how many has it done now...
cheers again
Check out my blog mnrvortxhayabusa@blogspot.com
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locoR1
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| posted on 17/2/10 at 10:33 PM |
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It had done 8k when i got it its done another 10-12k in the car half of that turboed.
I drive it hard but don't abuse the gearbox, i striped it down this winter, was starting to get noisey (transmission wine) so thinking it was
developing a gearbox problem thought i had better have a look couldn't find anything wrong! turned out it was the diff bearings.
Was with the turbo fitted 12.1sec 1/4 is my best time @ 117mph recon i can get into the 11's now ive got decent tyres.
Description
Check out my CB500T Cafe Racer build diary
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big_l
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| posted on 18/2/10 at 07:50 PM |
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oh cool thanks for the info ..
that sounds super fast ..
they say its won or lost in the first 60ft!!
Check out my blog mnrvortxhayabusa@blogspot.com
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