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#Post#: 1910--------------------------------------------------
JMR powered hillclimb & sprint MK2
By: JMR Date: July 3, 2014, 6:25 pm
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Some MK2 action for your pleasure...
Rising Hillclimb & Sprint man Jon Wool runs Mr Sticker along
with father Chris and makes all my Logo's, cards, stickers etc,
and started taking an interest in MK2 Golf's a couple of years
ago, first with a 16v road car which he swapped in an ABF after
killing the KR, then the current race car came up for grabs at a
steal with a modded 8v on K-star, Koni's, Eibach bars etc. Jon
stripped it to use in the road class in Hill's & Sprints after a
couple of local fun day events saw the "go faster" bug tap him
on the shoulder, first with a head and cam upgrade from what was
originally fitted, followed by some bargain 45 Dellorto's...the
bug was starting to nibble a bit harder by then, along with a
4.25 final drive and Quaife diff...actually "my" Quaife
diff...about time I upgraded!
We squeezed 150hp from the old engine with poor squish, a std
valve ported head and a Newman 280 road cam, which saw Jon start
to harass some of the mid field cars in the class, along with
some more chassis & brake work & a bit of a diet...the car not
Jon. However, upon starting the car to put on the trailer for
the last event of last year we had a call from Jon to "come and
listen to this noise will ya and tell me if I can use
it"!.....not with a knocking big end you cant no!
So over the winter Jon hunted down a std 1800 block with good
bores & pistons and we set about a fresh bottom end. Jon wanted
to get involved to not only lighten my load but just show an
interest in what goes on to build a modified engine. I had the
piston crowns machined to give a full diameter squish band and a
reduced bowl to raise the C.R, along with tighter clearance once
the block was machined down to suit. Jon set about cleaning
everything to my standard & gave the block a fresh coat of
paint. I fitted up the rods with ARP bolts and re rung the
pistons and popped them into the freshly honed bores, leaving
Jon to torque everything up and dress up the block ready for the
head.
A part way through the build I had regular calls along the lines
of "what if we..." from Jon, resulting in his "budget" engine
getting some of our steel buckets, my favoured 318 degree
hillclimb cam ground by Piper for me some and Isky valve
springs. The head received it's third round of mods with some
40.5mm inlets as they fit on the std seats and the original 33mm
exhausts.
We popped it on the engine dyno for a work out at AP Motorsport
where Alvin and I squeezed 170hp at 7000 from it. The above spec
head/cam/carb combo is capable of making well over 180hp in 1800
form at 500-1000 more rpm, but we've found the realistic ceiling
of std piston rings. Due to the thicker nature of them over thin
items in forged pistons they break the seal against the bore
wall much over 7k due to flutter and create high crank case
pressure which in turn forces oil out of the breather...at least
Alvin's dyno wont go rusty!
I've seen this before and thought it was an isolated case but
this is the 3rd time now on 1800's with std pistons...Nick
Penfold's VAG trophy car above is showing signs of it after a
couple of years hard use knocking on the door of 7-1/2k at
times, though driving through 7000 isn't as hard on them as
holding it over 7 on the dyno....the positive side of this is
knowing the limits and making engines survive by using them as
intended, though they appear to be withstanding the abuse so far
on a 13:1 C.R and have given Jon a couple of 3rd's in class this
year to date, his times now knocking on the door of some of my
old times but 20hp less and over 100 kilo's more, so we're both
more than happy with the performance.
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140429_161856_zps9ca47536.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140429_161856_zps9ca47536.jpg[/img][/URL]
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140501_183528_zpscf2ecf57.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140501_183528_zpscf2ecf57.jpg[/img][/URL]
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140509_140941_zps9de74e27.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140509_140941_zps9de74e27.jpg[/img][/URL]
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140509_140926_zps69852e09.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140509_140926_zps69852e09.jpg[/img][/URL]
Jon in action at Wiscombe hillclimb...
HTML http://www.youtube.com/watch?v=Ye0hdtEyc04
HTML http://www.youtube.com/watch?v=Ye0hdtEyc04
#Post#: 1911--------------------------------------------------
Re: JMR powered hillclimb & sprint MK2
By: ces Date: July 4, 2014, 9:40 am
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interesting & nice 8)
#Post#: 1914--------------------------------------------------
Re: JMR powered hillclimb & sprint MK2
By: Tristan Date: July 8, 2014, 5:34 pm
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Interesting idea on machining the pistons, does it make much
difference? Do you need to deck the block after?
#Post#: 1915--------------------------------------------------
Re: JMR powered hillclimb & sprint MK2
By: JMR Date: July 8, 2014, 8:02 pm
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Thanks ces
Yes block needs decking Tris. If you go too overboard tho with
the bowl reduction the ring land can break up due to a
combination of weakened piston deck, higher cylinder pressures
and the rings fluttering...I only reduced the bowl by 2cc to
8cc. The same trick will work on a 16v too.
#Post#: 2279--------------------------------------------------
Re: JMR powered hillclimb & sprint MK2
By: RobertsJulia Date: December 16, 2018, 10:36 pm
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's, cards, stickers etc, and started taking an interest in MK2
Golf's a couple of years ago, first with a 16v road car which he
swapped in an ABF after killing the KR, then the current race
car
#Post#: 2324--------------------------------------------------
Re: JMR powered hillclimb & sprint MK2
By: Henmeawna Date: November 11, 2019, 4:18 am
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The feeling of me now is very glad to be with everyone here.
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