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Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
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*metalman*
Posted 12/6/2013 2:47 PM (#698265)
Subject: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
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Posts: 280
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Location: Nottinghamshire/Derbyshire		I have been toying with the idea of putting a 1600/1800 16v into my car, so bit the bullet and went for it. My good old jock friend also convinced me to go bike carbs in the future (he is a genius with megajolt and r1 carbs having done many conversions) so here it is.....I will update the progress so far when I get time away from work. Enjoy
tom reid
Posted 30/6/2013 8:18 AM (#699324 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
New user

Posts: 7

I'm the Jock mentioned above,keep waiting for metalmnan to update this thread, he has'nt so I will.
Donor car, a badly abused MG ZR, but the engine had been rebuilt by a mate of mine a couple of years ago and hadn't been used much since the car had been crashed into a streetlamp, so we got it running and it ran sweet.

Engine was looking scabby, so it was cleaned up.
tom reid
Posted 30/6/2013 8:37 AM (#699325 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
New user

Posts: 7
tidying the engine.


It was treated to a new cam belt and vernier pulleys, these will help optomise the cam timing on the std cams just now and will really be needed when I get the spare head ported, ready for some fast road cams when the R1 conversion takes place.

Here's the car.

In all it's 1100cc glory.


Bye bye 1100


The bolts holding the engine mounting bar had badly corroded heads, these were replaced with ones.


1600 flywheel was sourced and lightened.

Lightened flywheel and old std one.

1600 fitted.





































*metalman*
Posted 30/6/2013 5:23 PM (#699349 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
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Posts: 280
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Location: Nottinghamshire/Derbyshire		Look at that as if by magic...
*metalman*
Posted 2/12/2013 6:25 PM (#707054 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
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Posts: 280
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Location: Nottinghamshire/Derbyshire		We think we have traced the running problem to a duff pump...will put pics of fuel pressure gauge up soon...will change pump and see what happens.
*metalman*
Posted 13/9/2014 6:15 PM (#714458 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
Regular

Posts: 280
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Location: Nottinghamshire/Derbyshire		A lot has happened since this was last updated (I will put a proper thread up from start to finish when I get chance) but this is where it stands at the moment....Will add a picture below (once I remember my photo bucket details!)
*metalman*
Posted 13/9/2014 6:20 PM (#714459 - in reply to #714458)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
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Posts: 280
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Location: Nottinghamshire/Derbyshire
DotMatrix
Posted 13/9/2014 9:19 PM (#714468 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)


Expert

Posts: 4458
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Location: Jelling, Denmark		will be exciting to see how you do with the bike carbs. exciting project
*metalman*
Posted 14/9/2014 12:13 PM (#714481 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
Regular

Posts: 280
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Location: Nottinghamshire/Derbyshire		The bloke who put the other pics on is a genius with them so all should be good. Excited to hear it and drive it
*metalman*
Posted 17/2/2016 5:31 PM (#721147 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
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Posts: 280
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Location: Nottinghamshire/Derbyshire		so..as a long overdue update to this. I had a custom manifold made. A few pics are below. The workmanship is unbelievable if I'm honest.













Edited by *metalman* 17/2/2016 5:33 PM
*metalman*
Posted 17/2/2016 5:36 PM (#721148 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
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Location: Nottinghamshire/Derbyshire		And here are some of the manifold fitted up to the car...

The real money shot! Its starting to look like a car again instead of a collection of parts.



After this I decided to mock up the carbs onto the engine (excuse the poor fitment, I will be using proper R1 carb rubbers to fit them)


*metalman*
Posted 17/2/2016 5:43 PM (#721149 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
Regular

Posts: 280
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Location: Nottinghamshire/Derbyshire		Since the manifold was now in place (held by a top secret rubberised compound - no gasket!), it was time to move on to rebuilding and rejetting the carbs.

Step 1. Flip the carbs upside down and remove the underside of the float bowls.



Step 2. Inspect.



Dirty and full of crud!



Step 3. Remove main jet (the slotted bit on top of the big hex)



Step 4. Make the main jet bigger!



Step 5. Refit enlarged main jet. Size depends on engine size and state of tune.





Edited by *metalman* 17/2/2016 7:08 PM
Saxokid100
Posted 18/2/2016 1:49 AM (#721150 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)


dot dot dot Rally Spec

100252525
Location: Northwest		Looks very nice engine build.
joshmk4
Posted 18/2/2016 6:55 AM (#721152 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)


Regular

Posts: 145
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Location: Lincolnshire		One thing I've never done nor been advised to is drill out jets, that's all a bit silly haha,nice build how ever though
DotMatrix
Posted 18/2/2016 3:18 PM (#721153 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)


Expert

Posts: 4458
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Location: Jelling, Denmark		your new mainfold looks great but doesn't seem to have the small waterpipe at the cambelt end, will this be a problem?
tom reid
Posted 20/2/2016 12:35 PM (#721173 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
New user

Posts: 7

The water pipe fitting was not on the manifold at the time the pics were taken, it is now though.
*metalman*
Posted 24/2/2016 8:01 PM (#721226 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
Regular

Posts: 280
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Location: Nottinghamshire/Derbyshire		As Tom said, the manifold was fabricated without the small water pipe fitting,we added this before fitting the manifold to the car, so it all functions as intended.
glyn-ellis
Posted 25/2/2016 11:47 PM (#721243 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
Elite Veteran

Posts: 697
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Location: leigh 		Got to love a bike carb set up.. I can already here the induction roar! Glad to see some one not following the pack aswel!
DotMatrix
Posted 26/2/2016 11:51 AM (#721248 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)


Expert

Posts: 4458
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Location: Jelling, Denmark		yes it will be interesting to see a dyno graph
alexwuk
Posted 29/2/2016 9:49 PM (#721288 - in reply to #721152)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
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Location: west bromwich, birmingham
joshmk4 - 18/2/2016 6:55 AM

One thing I've never done nor been advised to is drill out jets, that's all a bit silly haha,nice build how ever though


done it several times over the years need good drills and a lathe to do it right, how it works ifjet is a 100 that is 1mm hole center so if u needed a 170 jet you would need a 1.70mm drill and so forth ect

Alex
joshmk4
Posted 29/2/2016 11:27 PM (#721289 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)


Regular

Posts: 145
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Location: Lincolnshire		Makes sense, but different Carb manufactutes use different number ratings, seems a ballache calculating it?
*metalman*
Posted 11/3/2016 8:15 PM (#721424 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
Regular

Posts: 280
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Location: Nottinghamshire/Derbyshire		Having a good set of small sized drill bits works wonders. I have driven a couple of bike carb cars that have been done this way and I can assure you they respond very well. It may seem pikey drilling jets but it works. And as above, the induction roar is like nothing else.
glyn-ellis
Posted 12/3/2016 7:40 AM (#721427 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
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Posts: 697
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Location: leigh 		How are you going to control the spark?
*metalman*
Posted 2/4/2016 1:31 PM (#721699 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
Regular

Posts: 280
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Location: Nottinghamshire/Derbyshire		Spark is controlled by Megajolt. Uses a Ford coilpack and edis and you can map the spark to whatever you like.

Edited by *metalman* 2/4/2016 2:01 PM
*metalman*
Posted 2/4/2016 1:51 PM (#721700 - in reply to #698265)
Subject: RE: Tahiti r100 moredoor meets mg zr120 (with r1 carbs coming soon)
Regular

Posts: 280
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Location: Nottinghamshire/Derbyshire		Anyway. To crack on with the rebuild....

Step 6. Remove Idle jet.

Step 7. Redrill idle jet a tad larger.



Step 8. Refit idle jet.

URL=http://s122.photobucket.com/user/turkey666_ak/media/received_10154015531710628.jpeg.html]

Step 9. Lots of cleaning!

To go from this:



To this:



Step 10. Refit float bowls.

Step 11. Flip carbs over, remove plastic top and start to check the springs and needles.



Hang on. This spring looks a little shorter than standard. (More on that later!)

Step 12. Remove diaphragm and check for dirt/grit.



Looks pretty clean, it wasn't!

Step 13. Remove needle from diaphragm body.



Hang on, how many grooves are on top of the needle? (we are almost there.....)






Edited by *metalman* 2/4/2016 1:59 PM
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