war
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compression ratio 10.5:1 measurements please. pinto 2L
doing up my head on pinto 2L
i know i should be starting with a 1.6L pinto head, but where do you find them?
so can someone help out how to get the 2L head to the 10.5:1 compression ratio, i guess the only way is to machine the head, does anyone have the head height measurements to get that compression and if i there is any other tricks i am missing.
also looking for a fast road cam, if some has one (140-150hp aim)
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Matt75
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/01/14 14:38:46
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You can also machine the block so the pistons sit flush. This is a better way than machining the head though the head may benefit from a machine to ensure it's dead straight. It's a combo of many different things though.
I have a standard head at home I can measure.
Cheers,
Matt
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gazz
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/01/14 16:00:05
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im going to make a lot of assumptions about your engine and say that you probably have a standard bottom end.
to machine the block your going to need to pull your engine out and apart and im going to assume that you don't want to do that. in which case your pistons probably aren't going to come up anywhere near flush with the top of your block.
assuming you are going to use a felpro gasket with about 1mm compressed thickness.
so lets say that you probably need a combustion chamber of about 40-42cc's to achieve your desired 10.5:1
so you are probably going to have to machine between 1 and 1.5mm from your head.
hope that helps.
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war
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/01/14 20:19:30
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thank you
so if i machine the block to be flat with pistons and standard head it would be about right?
or if i machine the head to have 40cc's in the chamber its would be about right.(standard block)
and the best way is to machine the block?
PS i am taking motor out to freshin it up and do porting and new camshaft, using felpro/durapro gasket kit, twin idf 44 webers and pacemaker big bore extractors,verrier cam wheel just need a camshaft now, car is for weekend fun road use.
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spigot
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/01/15 08:35:30
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Is this a hc or lc motor?
Best to work it out once the engine is disassembled. There are a heap of online calculators. If the pistons are a mile down the hole you don't necessarily want to be lopping a heap off the deck.
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war
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/01/15 10:29:57
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spigot
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/01/15 11:34:08
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In reality compression is tied to your cam choice which is tied to your hp and rev range goals. I wouldn't be choosing some arbitrary compression ratio.
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Flighter
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/01/16 20:46:07
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What spigot said is correct. I might have to decrease my C.R. to use a cam I am considering, so start with the cam and work from there.
WTB: Recaro seat - any condition considered
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war
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/01/17 15:17:56
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I have decided on a FR33... thanks now just compression ratio to do..
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Timw
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/02/04 22:30:03
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It would be a lot better to start from head airflow, then compression ratio, then expected max torque rpm then get to know some one that can explain how the cams on a pinto actually work, as where is a lot to learn. Engine tune software will tell you what is theorically possible but the real test is on the dyno when even more variables are at play.
post edited by Timw - 2014/02/04 22:35:01
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the_cheese
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/02/28 15:45:21
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As said here, plenty of compression ratio calculators out there on the net.
Standard bore is 90.8mm
Standard piston to block deck is 0.5mm (mine came up 0.4)
Standard combustion chamber on an unshaved head is 48cc
Standard head height (head face to bit where rocker cover is bolted on) should apparently be 94.8mm, mine came up 95mm (sierra head).
If you are going to take the engine out, get meat taken off the block rather than the head. For best results, get both skimmed so they are dead straight. You can always gain more compression by going thinner gaskets (felpro) without going to far on block or head planing, so factor that in too!
I've got a kent FR32 that I thinking of swapping out for a low duration, high lift unit (ie FR30, BF134). If you are keen, send me a PM. The cam is in tip top condition.
Cheers
Nick
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war
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/02/28 20:09:47
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hi nick,
i have rebuilt the engine now fr33, compression ratio worked to be 10.55:1 complete rebuild, all the parts and machining done at Performance Mods in Ossy park(Danny was awesome), Harris Engines for the head.
running the engine in now.
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the_cheese
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/03/02 12:34:47
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No worries. Great to hear it is up and running. Got my cyl head in at harris engines at the moment. Mark there has helped me with a head for a GQ patrol before and has treated me very well in the past. Can really recommend that joint. What sort of gear have you got in the bottom end? What sort fo carb(s) are you running? Im aim to go a bit milder on mine, 10:1 compression and a torque cam
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war
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/03/03 21:05:07
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hey cheese
bottom end crank regrind acl bearings, balanced , re honed, decked block, lightened flywheel etc.
head (already had a lot of porting done, got told to much taken from the ports) head had full service, cut the intake valves new rear profile cc the head, machine head to suit 10.5 to 1
twin idf 44mm webers , pacemaker extractors and new 2 /4" exhaust
its has more torque than the last engine.
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war
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Re: compression ratio 10.5:1 measurements please. pinto 2L
2014/03/03 21:05:07
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hey cheese
bottom end crank regrind acl bearings, balanced , re honed, decked block, lightened flywheel etc.
head (already had a lot of porting done, got told to much taken from the ports) head had full service, cut the intake valves new rear profile cc the head, machine head to suit 10.5 to 1
twin idf 44mm webers , pacemaker extractors and new 2 /4" exhaust
its has more torque than the last engine.
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