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Joined: Aug 2001
Posts: 210
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Ok, I need to know what kinda compresseion ratio would be expected from using non svt 2.5 heads with the 3L echaust valves...And whatever it is, do you think that it will be okay?
TIA
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Joined: Aug 2001
Posts: 176
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Compression will be the same 11.2:1 you'll just be able to breath better so you'll see a increase in HP.
2000 Roush Cougar MTX
MSDS Headers, Rear disc conversion, SVT TB and IM, Custom 2.5" exhaust, Weapon R Dragon w/kkm MAF adaptor, B&M, NR wht gauges
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Joined: Jun 2000
Posts: 1,218
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REally??? 
Chow
1998 SVT #2263 of 6535
chowsvt@msn.com
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Joined: Jun 2001
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Still battling some pinging gremlins with my 11.2:1 compression on 94 octane. Doesn't matter what valves you use, that's still a lot of compression.
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Joined: Sep 2000
Posts: 5,805
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CR changes between 'stoc' 2.5's & SVT 2.5 are done by pistons not chamber volume........hence stoc or svt heads you will still be over 11:1 on a 3.0 block....... 
V6 MTX
'Don't p**s up my back then tell me it's raining!!!"
'Its only nuts & bolts!'
'If I build it,fix it,upgrade it or modify it...MAYBE they will come....!
Haines Motor Sports Inc,
Dealer for 'Quaife America' & 'Autotech Sport Tuning'
SOLE USA Dealer for the American Axle 'AUSSIE BAR'...
Get a Turbo for you Zetec from HMS Inc...by 'The Demon' ...www.DemonDynamics.co.uk
..don't talk about it DO IT !!!
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Joined: Aug 2001
Posts: 176
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Posts: 176 |
PA are you the only one expereiencing pinging? I'm just concerned cause bnoon and I are working on a swap and were going to run the 11.1:1 CR and the highest gas I can get is 91 around here. Any ideas why yours does it and no one else? Terry?
Would the greddy timing function work if warmonger gets it to work?
2000 Roush Cougar MTX
MSDS Headers, Rear disc conversion, SVT TB and IM, Custom 2.5" exhaust, Weapon R Dragon w/kkm MAF adaptor, B&M, NR wht gauges
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Joined: Mar 2002
Posts: 154
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Just use 2 sets of head gaskets... Lowers the CR nicely. Sorry, couldn't resist.
95 mystique LS, High Output Cougar S (SVT) 2.5L engine & MTX75
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Joined: Sep 2000
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AHHHHHHHHHHHHHHHH...NEVER EVER NO SIR...use a single thicker but not two..You need either fuel enrichment or ign retard...or both at that CR and bloody cool intake air...det kills a motor...er...Buckshot...what do we know about CR & det?????
V6 MTX
'Don't p**s up my back then tell me it's raining!!!"
'Its only nuts & bolts!'
'If I build it,fix it,upgrade it or modify it...MAYBE they will come....!
Haines Motor Sports Inc,
Dealer for 'Quaife America' & 'Autotech Sport Tuning'
SOLE USA Dealer for the American Axle 'AUSSIE BAR'...
Get a Turbo for you Zetec from HMS Inc...by 'The Demon' ...www.DemonDynamics.co.uk
..don't talk about it DO IT !!!
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Joined: Jun 2000
Posts: 3,562
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Kinger, I've never had a ping on mine. Ingnition maps look fine, the dyno looks fine (a bit fat on top, could use a chip), and my SE heads are untouched, save for a tiny bit of material removed from the very edge of the chamber to eliminate the pointed edge (thin point = hot spot on an overlapping edge into a larger cylinder is bad, mmmmmmmmk?). I run 92 octane Ultimate from Amaco, but have been known to get by on 90 as well. Fat pipe CAI helps keep cool air coming in. Red Line watter wetter helps to drop coolant temps a few degrees. Now I need an oil cooler after hearing Terry's SZ stories!!! 
Brad Noon '99 SE MTX 3 point oh my God H.O. 179HP/178TQ BNMotorsports Floormats, powder coating, TB optimizing, Gutted cats, etc BNMotorsports is now the preferred distributor of Contour/SVT/Mystique Indiglo style gauges!!!bnmotorsports@msn.com
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Joined: Jul 2000
Posts: 154
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I ping like a mother unless I run 104 octane, it sucks, or 91 octane with 1-2 bottles of octane booster!!
2001 Mercury Cougar Aerogear WideBody Kit, Aerogear Carbon Fiber Hood 3.0 Hybrid 251hp and 229tq at the front wheels Eibach springs, Koni Stuts, Aussie Bar, ST200 R Strut bar, OMP front Strut bar, 19" RPM's 235/35-19 Nitto 555's All Alpine System - IVA-C801, DHA-s680, NVE-N852A, TCS-V430A, TMX-R705, TME-M580 x2, PXA-H900, MRD-M500 x2, MRV-f540 x2, SPS-0829, SPX-F17t, SPX-17m x2, SWR-1021D x4, RUX-4280 http://www.geocities.com/socal_neco/jimmy.htm
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