New M42 Rally Build
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petsracing1

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New M42 Rally Build
« on: August 29, 2015, 04:54:47 AM »
M42 Rally

M42 standard bottom end
1839cc using 85mm Mahle motorsport pistons
Supertech 1mm larger inlet valves
Dbilas valve springs
Cometic head gasket
Kennelly Cams 278° 10.7mm lift
Still on hydraulic lifters
Kennelly tickled head
E46 M3 50mm throttle bodies mounted to a gttechnic manifold adapter
9lbs Lightweight alloy flywheel

Looking forward to making it go 2 years in the making
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petsracing1

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Re: New M42 Rally Build
« Reply #1 on: August 29, 2015, 04:56:29 AM »
Some more photos
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petsracing1

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Re: New M42 Rally Build
« Reply #2 on: August 29, 2015, 05:06:50 AM »
Getting close
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wazzu70

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Re: New M42 Rally Build
« Reply #3 on: August 29, 2015, 12:20:39 PM »
Nice!!
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-Nick
91 E30 M42 with VEMS

Darky

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Re: New M42 Rally Build
« Reply #4 on: August 29, 2015, 06:53:16 PM »
Hi

Nice, what compression and how long are your inlet runners?

Cheers Rohan
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petsracing1

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Re: New M42 Rally Build
« Reply #5 on: August 29, 2015, 09:06:43 PM »
Runners are pvc pipe starting with 385mm. And the compression is 12.1 most we could get with out getting serious
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benz-tech

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Re: New M42 Rally Build
« Reply #6 on: August 30, 2015, 10:18:57 AM »
What rpm do you intend to turn? Those cams and intake have 8,500 written all over them, although the box looks a bit small
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Pi is apparently the multiplier for your engine swap budget as well.

petsracing1

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Re: New M42 Rally Build
« Reply #7 on: September 01, 2015, 12:45:00 AM »
8500rpm is what we are hoping for but might be restricted because of the hydraulic lifters
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Darky

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Re: New M42 Rally Build
« Reply #8 on: September 01, 2015, 02:42:16 AM »
Hi

Neat, what's the internal diameter of the pvc runners, have they been bell mouthed, trumpets?

Do you have the oringinal trumpets for those itbs? What's there internal diameter?

Cheers Rohan
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petsracing1

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Re: New M42 Rally Build
« Reply #9 on: September 01, 2015, 04:52:13 AM »
hi

will get some more photos tomorrow

thanks
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petsracing1

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Re: New M42 Rally Build
« Reply #10 on: September 02, 2015, 01:59:50 AM »
Internal diameter of the runners is 50mm and made a spacer to make the air box bigger if needed out of a nylon chopping board. Because it's a rally engine we are going for response  rather than top end horsepower. Trumpets as you can see, not factory. Once we have found the best runner length we might have a go at making some tapered runners.
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petsracing1

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Re: New M42 Rally Build
« Reply #11 on: November 14, 2015, 04:02:42 AM »
The second event after getting the new engine running still need to do exhaust as it is getting a lot of reversion with the factory exhaust at low revs
https://www.youtube.com/watch?v=1POPLMR1Yts
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jerseytim

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Re: New M42 Rally Build
« Reply #12 on: November 14, 2015, 09:23:58 AM »
are you still using the afm and what power is it making?
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petsracing1

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Re: New M42 Rally Build
« Reply #13 on: November 14, 2015, 05:54:42 PM »
We have not had the car on the dyno and are not using an afm
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sh123

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Re: New M42 Rally Build
« Reply #14 on: November 14, 2015, 06:05:45 PM »
out of interest what gearbox and diff do you run? 3rd seems quite a step.

Engine sounds very nice though!
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