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#Post#: 1963--------------------------------------------------
2ltr 16v trackday engine
By: JMR Date: August 11, 2014, 4:59 am
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Just to prove we're not totally 8v biased here's some multi
valve action for you....
I was approached by Duncan Brown on here about building a box of
bits that he had acquired. Most of the bits were there but
although Duncan wasn't chasing a power figure as such he said
215-220hp would be nice and anything more a bonus (I was long
for the "more" bit!), though he would prefer decent torque
rather than all out numbers. With the parts we had to hand I
suggested to Duncan that some of the parts would need upgrading
to reach his target, namely the cams...Newman 272 hydro's...and
the exhaust manifold...an off the shelf road based 4-1.
Among the parts was a ported cylinder head so I started from
there to see what we had to work with. Airflow was decent to be
fair but was achieved via ports that were too big and throats
that are too small, so my concern was low & mid torque could be
hurt, however there was plenty of flow for top end
breathing....that wasn't the biggest issues though. At some
point in it's past the valves seat's must have been cut by the
machine shops tea maker as I doubt someone who knew what they
were doing had done them. However the main issue was both the
head & inlet manifold faces...the same tea maker must have been
asked to clean them up but didn't really understand the job in
hand as I'd imagine he used a variety of smooth grit wet 'n' dry
to get the finish but with wildly varying hand pressure as there
wasn't a straight surface on either!....tarted up for sale
springs to mind.
After assessment at my machinists he declared he could true up
the faces and re-cut the seats so we went with that to save
starting from scratch with another head. Once we knew what we
were working with I looked at cam spec's to suit and found
exactly what I wanted with Piper's 290 degree race profile.
Duncan didn't want to use more than 8000rpm so I wanted to see
peak power at around 7500rpm and I had a torque target of
170-175ib/ft. With steel cam buckets and race valve springs
added into the mix I built & shimmed the head up to suit.
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140527_120335_zpsaf157cb0.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140527_120335_zpsaf157cb0.jpg[/img][/URL]
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140527_134309_zps5e9e1667.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140527_134309_zps5e9e1667.jpg[/img][/URL]
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140530_141009_zps412cca98.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140530_141009_zps412cca98.jpg[/img][/URL]
With the hefty skim needed to true up the head face we had a
very shallow chamber, so the forged pistons needed their raised
compression crown reducing a fair bit to bring the C.R back in
line and the valve pockets deepened to clear the valves at TDC.
With the machining done and the block decked to give the
required squish I use the bottom end was built up with the steel
H section rods and wedged crank as supplied, with ARP studs used
to secure the main caps and the head.
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140523_132233_zps51ce9d43.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140523_132233_zps51ce9d43.jpg[/img][/URL]
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140527_114103_zps20cf3964.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140527_114103_zps20cf3964.jpg[/img][/URL]
Duncan supplied some KMS throttle bodies to go on our JMR inlet
manifold, and ventured off to Tony Law Exhausts with the
manifold spec I gave him to suit the powerband I wanted to
achieve.
After bolting the engine on to the AP Motorsport dyno Alvin set
about setting up the Omex management and squeezed all that was
possible from what we had....
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140605_103527_zps6f88dabc.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140605_103527_zps6f88dabc.jpg[/img][/URL]
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/20140615_182539_zpsd20e774f.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/20140615_182539_zpsd20e774f.jpg[/img][/URL]
...which was 229hp @ 7,500rpm (229.99 if we want to be picky!),
holding 223.75 @ 8000 and 172ib/ft of torque @ 5,500rpm. With
the torque target hit and hp bonus over what Duncan was hoping
for it should drag a MK1 Golf around the circuits ok.
HTML https://www.youtube.com/watch?v=Kh72umPWXEg
HTML https://www.youtube.com/watch?v=Kh72umPWXEg
...turn it up!.....
HTML https://www.youtube.com/watch?v=3BIcYHyAJII
HTML https://www.youtube.com/watch?v=3BIcYHyAJII
[URL=
HTML http://s66.photobucket.com/user/mrhillclimber/media/IMG-20140604-WA0000_zps2ee469ba.jpg.html][IMG]http://i66.photobucket.com/albums/h278/mrhillclimber/IMG-20140604-WA0000_zps2ee469ba.jpg[/img][/URL]
#Post#: 1965--------------------------------------------------
Re: 2ltr 16v trackday engine
By: ces Date: August 12, 2014, 3:18 am
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HTML http://blogs.u2u.be/diederik/image.axd?picture=2010%2F12%2FSmileyThumbsUp.jpg
#Post#: 2000--------------------------------------------------
Re: 2ltr 16v trackday engine
By: Nige Date: November 8, 2014, 2:17 am
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Duncan was telling me about this when I had my car over the
other day. Spec sounded good and he numbers back that up ! Nice
one.
#Post#: 2003--------------------------------------------------
Re: 2ltr 16v trackday engine
By: chrismc Date: November 21, 2014, 11:15 am
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Ooo- that sound brings back memories :)
Should pull a mk1 round rather well ;D
#Post#: 2010--------------------------------------------------
Re: 2ltr 16v trackday engine
By: Tristan Date: December 12, 2014, 6:17 pm
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awesome. whats the torque curve like?
#Post#: 2015--------------------------------------------------
Re: 2ltr 16v trackday engine
By: JMR Date: December 15, 2014, 3:21 am
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Thanks guy's. .glad you like it.
I'll get the dyno graph up Tristan.
#Post#: 2044--------------------------------------------------
Re: 2ltr 16v trackday engine
By: Tristan Date: December 29, 2014, 6:16 pm
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Does that mani fit a stock engine bay?
#Post#: 2061--------------------------------------------------
Re: 2ltr 16v trackday engine
By: JMR Date: January 1, 2015, 6:30 am
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Yeah it's a custom one built in a Mk1. .the system will need
some juggling but thats fairly simple.
Tim had one done with a single large re packable box...another
Tony Law job like this one.
#Post#: 2287--------------------------------------------------
Re: 2ltr 16v trackday engine
By: Lightmuia Date: December 26, 2018, 10:16 pm
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One thing we can truly make the content we see here, then you
need to look elsewhere.
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