guardian angel
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| posted on 10/4/12 at 10:20 AM |
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2l Pinto Tuning advice
Help!
I am in the process of tuning up my 2l pinto in my Mk3 Capri. I have a 205 block and an injection head. I haven't been able to confirm yet if
it's the unleaded varity as I can't find any markings on the head!
I plan on fitting a Piper 285 camshaft, vernier pulley and a set of Yamaha R1 bike carbs on Bogg Bros inlet manifold (these have all been purchased
already).
The problem comes on what to do, or not next!
I contacted a local engine builders for advice/prices and they recommended to gas flow the head, bore the block 1mm, fit mahle pistons, up the
compression ratio and get the engine balanced. That's along with them fitting the camshaft, vernier pulley and bike carbs, and then putting the
whole thing on a dyno to dial it in. Now that sounds fine except the cost is quite high!
I am just trying to create a fast road spec engine here, not mega power. With that in mind, for my cam and bike carbs to work well/properly do I need
to gas flow my head? Also, do I need to do a rebore, change pistons and increase the compression ratio for my cam and bike carbs to work well?
Advice would be great as I'm learning as I go here
[Edited on 10/4/12 by guardian angel]
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maccmike
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| posted on 10/4/12 at 10:33 AM |
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Alternatitive: reduce weight.
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mookaloid
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| posted on 10/4/12 at 11:41 AM |
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unless the engine needs a rebore cos it's knackered don't bother with this. The power gain will be in the low single figures from this.
Balancing the crank/rods/pistons/flywheel/clutch is a good idea. as is a sensibly lightened flywheel.
The main power gains with a pinto are to be had by improving the gas flow. This means better flow in the head. The bike carbs are good but no better
than say a 38 DGAS if you don't do the gas flowing in the head.
Also consider improving the valves and a skim to raise compression ratio.
much cheaper to fit a zetec though!
Cheers
mark
"That thing you're thinking - it wont be that."
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snapper
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| posted on 10/4/12 at 11:43 AM |
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I you have not got one, fit an injection head, worth 10bhp on its own
More compression up to a max 10.5 with cast pistons can be done by skimming the head and using a thinner gasket
Rolling road
Bigger inlet valves with throat under the valve opened out.
Balancing is nice to do but does not get any more power
Crank scraper worth 2 to 3%
Lighter flywheel
3.9 diff
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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scudderfish
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| posted on 10/4/12 at 11:44 AM |
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How about something like this?
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guardian angel
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| posted on 10/4/12 at 12:08 PM |
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Superb, thanks guys
So from what your saying I can raise the compression ratio by just skimming the head and using my standard pistons? That would certainly save on a
rebore and new pistons
Sounds like gas flowing is the way to go as I thought it may be, shame it has to be one of the most expensive mods! I hear what your saying on the
balancing and flywheel lightening as well, but this seems like more of an extra then anything right?
So the main things I will need to get done then are gas flowing the head, and raising the compression ratio.
I did consider the zetec route but the cost of all the components required for the conversion seemed pretty steep. Plus I kinda like my old pinto, is
nice and simple
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snapper
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| posted on 10/4/12 at 02:29 PM |
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Cheap way is injection head skimmed and a Victor Rienz head gasket
You'll have to check but the gasket is 1.27mm and will take a standard engine from 9.2 to 1 to about 9.5 to 1
Probably 1mm skim will get 10.5 to 1
285 cam and bike carbs and I would expect a solid 135 bhp with a potential 145 if it's put together well.
Look on eBay for a modified head but be carefull there's a lot of crap about.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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mark chandler
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| posted on 10/4/12 at 03:02 PM |
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Look for Dave Vizards book on pinto tuning, exhaust, head and carbs then followed by cam as the standard one is pretty good when dialled in with 7
degrees advance.
Regards Mark
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mcerd1
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| posted on 10/4/12 at 03:07 PM |
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its not very cost effective but there are lots and lots of different ways to tune a pinto
this book is well worth a read:
linky
but don't pay that much for one - I got mine with a few oily finger prints on it for £3 on ebay
the des hammill books quite good too (again there are plenty of cheap s/h copies around if you look)
Like you I've also got a 205 block, EFI head, 285 cam, vernier and bike carbs on a bog bros manifold (ZX9R's in my case)
but unlike you I don't know when to stop
so I've also overbored it by 2.25mm (93mm) and fitted forged pistons (Accralite), crank oil scraper, megajolt ignition, cossie YB conrods &
crank and a steel flywheel - also the CR should be up to 11.5 to 1
so far I've not ported the head (that can wait until the car is actually on the road !! ) so its standard apart from 3 angle valve seats, bronze
guides and a bit of a skim...
I'm not expecting much power gain from my bottom end (1% or 2% if I'm lucky) but it should give me that bit more torque and the steel
cossie bits are bomb proof so I'll be able to rev it as hard as the cam/valves will let me 
for fast road use the biggest gains will be found in the port shapes (stock ones are quite bad  ) and the 3 angle valve seats and a skim will help
while your at it
the books above tell you what to aim for if you want to have a go at the porting bit yourself, but you might want to find a spare head to practice on
first
other than that a bit of attention to detail like matching the inlet manifold to the head and so on will all help get that last little bit of power
out of it for minimal cost
[Edited on 10/4/2012 by mcerd1]
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jacko
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| posted on 10/4/12 at 04:11 PM |
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Mine has
re bore +60
piper 285 cam
head planned 1mm off and polished ported its a inj head
adjustable.cam pulley
light flywheel [ modified standard ]
zx9r bike carbs
h&h dizzy
and set up at Bogg Brothers on there R /Road
140 bhp at rear wheels
Jacko
I believe all inj heads are lead free but may be wrong
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guardian angel
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| posted on 10/4/12 at 06:53 PM |
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Sounds like to get the best from my engine I'm just gonna have to bite the (financial) bullet and do it properly! My wife is gonna kill me
[Edited on 10/4/12 by guardian angel]
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snapper
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| posted on 11/4/12 at 05:12 AM |
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All injection heads are unleaded
The injection head has a smooth inlet valve seat short side. Turn and this what gives it the better flow
All Pinto inlet ports are big enough, the only work needed is to widen the port throats under the valve to gain flow with bigger valves
The Vizard book is very good but there is a lot of detail work to do.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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guardian angel
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| posted on 11/4/12 at 07:36 AM |
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So if I don't port/polish (gas flow) my injection head, will the Piper 285 Cam still work ok with the bike carbs? Or for it to work properly
does it really need gas flowing?
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mcerd1
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| posted on 11/4/12 at 10:00 AM |
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^^ It'll work fine without the gas flowing and you should have some decent gains on the std. setup
but gas flowing is the next place to look if you decide you have to have even more power
[Edited on 11/4/2012 by mcerd1]
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guardian angel
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| posted on 11/4/12 at 11:07 AM |
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Right, thanks. Now I think I know what to do. Thanks to all for your advice
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guardian angel
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| posted on 26/4/12 at 11:02 AM |
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Back again!
I have been looking into whether or not it's worth upping the compression ratio or not, as it kinda makes sense to have it done whilst the heads
off, it's just that I need to confirm what the standard/starting compression ratio was for the 205 block and injection head; does anyone know
what this was?
My haynes manual tells me that for the standard 2l pinto it was 9.2:1, but is this the same as the injection headed variant?
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mcerd1
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| posted on 26/4/12 at 09:20 PM |
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CR is the same on all of them apart from the low comp versions in the transits and P100 pickups
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