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| Ef-barrie |
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Hey lads,
What's the best combination to gain high comp? I've hered 30thou off the head with a au head gasket? I'll be running a crow cam 1514 with 112 lobe so wanting high 9s mid 10s comp? Any info would be great! Cheers |
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| cjh |
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Flat top pistons is the way to go.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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| Ef-barrie |
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Any info on flat tops? An what's involved in running a set of them? Also could anyone give me info on the best head work to gain high Comp?
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| Johnson stroker |
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Increased comp is usually done out of the bottom end not the top. shaving a head will bump it up slightly, but the correct way to go is a set of flat or lumpy tops that have been butterfly cut to suit and give sufficient PTV clearance.
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| Barnfind-EA |
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Ef-barrie wrote: Hey lads, What's the best combination to gain high comp? I've hered 30thou off the head with a au head gasket? I'll be running a crow cam 1514 with 112 lobe so wanting high 9s mid 10s comp? Any info would be great! Cheers This works. Will be doing this exact mod, early in the new year. Use a Tickford head.. they're cheap. What isnt cheap is buying pistons, having them fitted, balancing the new weights you will end up spending over 4k without any drama, and realise that you're about to build a whole performance motor from scratch. For me, its just about getting a bit more poke on a budget. Im not building a race car. |
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| Ef-barrie |
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Thanks barnfind-ea! Any more info on the right setup to use for head work? Best a series gasket tonise? How much to deck of the head?
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| Barnfind-EA |
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Ef-barrie wrote: Thanks barnfind-ea! Any more info on the right setup to use for head work? Best a series gasket tonise? How much to deck of the head? 30 thou decking, I was quoted $110 in Canberra (if you supply the bare head, off the engine) |
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| Ef-barrie |
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Thanks barnfind-ea! Any more info on the right setup to use for head work? Best a series gasket tonise? How much to deck of the head?
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| Sierra |
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Ef-barrie wrote: Hey lads, What's the best combination to gain high comp? I've hered 30thou off the head with a au head gasket? I'll be running a crow cam 1514 with 112 lobe so wanting high 9s mid 10s comp? Any info would be great! Cheers If this is your daily driver then be careful when looking for high comp ... The last thing you want is an engine that pings because you've gone too high in compression ... Just something to bear in mind ...
_________________ 95 EF XR6 Manual |
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| 67RCE |
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Decking the head screws with Quench. Pistons are the right way to bump compression.
_________________ ILL60 - EF XR8, Sunroof, Ticky Kit, 19x8.5/19x11 TE37's, 347, AFr185's, TFS BoxRcustom converter, Hurst Quarterstick, huge billet cam. |
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| 66 coupe |
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AU head, modified to take 11/32 stainless valves, CP pistons, 10.7:1
This is a supercharged methanol engine i built 050 off the head and 028 off the block, pistons are 008 down the hole id recommend camtech cam 845 or 842b depending on auto/manual/converter/diff gears also you dont really need to balance the i6's as they are internally balaced, if the pistons and rods are all the same weight then thats fine.   
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| ranga83 |
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Barnfind-EA wrote: Ef-barrie wrote: Hey lads, What's the best combination to gain high comp? I've hered 30thou off the head with a au head gasket? I'll be running a crow cam 1514 with 112 lobe so wanting high 9s mid 10s comp? Any info would be great! Cheers This works. Will be doing this exact mod, early in the new year. Use a Tickford head.. they're cheap. What isnt cheap is buying pistons, having them fitted, balancing the new weights you will end up spending over 4k without any drama, and realise that you're about to build a whole performance motor from scratch. For me, its just about getting a bit more poke on a budget. Im not building a race car. Just using a tickford head isnt going to get your comp into the 10s. Even with an au gasket. As said. Best way is with flattops. And if you are spending 4000 to get bored/decked/balance then u need to find someone else to do your work
_________________ ef futura, pacemakers, 2.5inch catback, k&n panel filter and 3.45 lsd. extractors/cat, ticky head, custom cam grind, t5. now onto cosmetics. |
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| Barnfind-EA |
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ranga83 wrote: Barnfind-EA wrote: Ef-barrie wrote: Hey lads, What's the best combination to gain high comp? I've hered 30thou off the head with a au head gasket? I'll be running a crow cam 1514 with 112 lobe so wanting high 9s mid 10s comp? Any info would be great! Cheers This works. Will be doing this exact mod, early in the new year. Use a Tickford head.. they're cheap. What isnt cheap is buying pistons, having them fitted, balancing the new weights you will end up spending over 4k without any drama, and realise that you're about to build a whole performance motor from scratch. For me, its just about getting a bit more poke on a budget. Im not building a race car. Just using a tickford head isnt going to get your comp into the 10s. Even with an au gasket. As said. Best way is with flattops. And if you are spending 4000 to get bored/decked/balance then u need to find someone else to do your work Just to have the engine removed and put back together is going to cost you $1000 in labour. If you buy new pistons/rods you will need to balance the engine (you can argue this if you like) Machine work is not cheap either. Post up some quotes if you like. Prove me wrong. As for the compression, I wont have a drama reaching 10:1 with an EF Tickford head. ford-4l-and-6-cylinder-f1/compression-ratio-head-shaving-t97431.html Starting at 9.3:1 Gaining 0.15 compression for each 10thou off the head. And 0.5 for the head gasket. Thats 0.95 additional compression. (unless of course that guy was completely wrong) |
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| SLOFRD |
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I had 50thou shaved off my tickford head, used mls gasket, cc'd the chamber, did the calculations and ended up with 10.75:1 comp ratio. Not the best way to increase compression though, I have pretty bad chain rattle, I'm still using the old chain and broken guides though.
_________________ 96 EFII XR6 - 4480 pacies, 100cpi 2.5" cat, lukey 2.5" exhaust, CT006845 Camtech Cam, ported t/body, Ported & polished & 50thou shaved head, pep pro stainless valves, h/duty valve springs, 10.75:1, custom CAI, 42lb injectors, Bosch 023, runs on E85, custom J3, shift kitted auto |
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| Barnfind-EA |
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SLOFRD wrote: I had 50thou shaved off my tickford head, used mls gasket, cc'd the chamber, did the calculations and ended up with 10.75:1 comp ratio. Not the best way to increase compression though, I have pretty bad chain rattle, I'm still using the old chain and broken guides though. 50 is a lot  See if you can remove 1 link from you chain, and add a half link. My friend added a half link to a Ford Laser Turbo set up we once did. Used a decompression plate.I cant see why this wouldn't work in reverse to avoid chain rattle. |
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