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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: 7MGE Compression Ratio - How High ??
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Mon, 28 July 2003 04:46
 
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| ed_ma61 wrote on Mon, 28 July 2003 14:27 |
old corollas: its interesting to see that youre still only getting a cranking pressure of 130psi...
i get this funny feeling in my bones that the 7m will be cranking 180+psi and that cant be a good thing.
ive just been doing some serious reading on methanol injection, fuel preignition and relative compression ratio's etc, and it 'should' be possible to run almost 11.5:1 with adequate methanol added.
i dont think ill go this far tho 
10.75/10.80:1 seems about on the money, and if i can configure (crudely) a methanol/ethanol system to work properly (manifold vacumm and rpm based) then high load, hi rpm situations should be ok.
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yeah it's a bit weird. it was getting 135-140 when it was freshly built, but that was 18 months (and a lot of rpm) ago.
a mate had a datto 200B, L20 motor, had somewhere around 11:1 CR, and had 210Psi cranking compression. no idea on cams. it ran very well with either LPG or rich with twin webers.
fwiw, stock cranking compression in a toyota 3K is 170-180Psi for 9:1 and 190Psi for the 10:1 models. both run pretty much similar (stock) cams. i don't hink 180Psi will be that bad.
hmmm, what can i think of that can use only a vacuum hose from the plenum and a wire to the tach? hmmmm 
seriously tho, for $180 and a bit of soldering time, you can have a system where you have 8 MAP points that you can put at any kPa you want around the last 10-15% of the MAP range. that should be enough resolution? (minimum resolution is about 1kPa)
LOL, one day  (after i get mine in)
Cya, Stewart
[Updated on: Mon, 28 July 2003 04:48]
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| | Subject | Poster | Date |
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7MGE Compression Ratio - How High ??
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ed_ma61 | Mon, 28 July 2003 00:43 |
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Re: 7MGE Compression Ratio - How High ??
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mr_mcfarlane | Mon, 28 July 2003 00:57 |
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Re: 7MGE Compression Ratio - How High ??
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justcallmefrank | Mon, 28 July 2003 00:59 |
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Re: 7MGE Compression Ratio - How High ??
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ed_ma61 | Mon, 28 July 2003 02:41 |
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Re: 7MGE Compression Ratio - How High ??
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justcallmefrank | Mon, 28 July 2003 02:47 |
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Re: 7MGE Compression Ratio - How High ??
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mr_mcfarlane | Mon, 28 July 2003 01:06 |
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Re: 7MGE Compression Ratio - How High ??
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rob_RA40 | Mon, 28 July 2003 01:13 |
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Re: 7MGE Compression Ratio - How High ??
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ed_ma61 | Mon, 28 July 2003 03:00 |
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Re: 7MGE Compression Ratio - How High ??
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oldcorollas | Mon, 28 July 2003 04:10 |
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Re: 7MGE Compression Ratio - How High ??
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ed_ma61 | Mon, 28 July 2003 04:01 |
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Re: 7MGE Compression Ratio - How High ??
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oldcorollas | Mon, 28 July 2003 04:19 |
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Re: 7MGE Compression Ratio - How High ??
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ed_ma61 | Mon, 28 July 2003 04:27 |
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Re: 7MGE Compression Ratio - How High ??
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oldcorollas | Mon, 28 July 2003 04:46 |
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Re: 7MGE Compression Ratio - How High ??
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BlackSupra | Mon, 28 July 2003 06:47 |
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Re: 7MGE Compression Ratio - How High ??
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ed_ma61 | Mon, 28 July 2003 08:20 |
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Re: 7MGE Compression Ratio - How High ??
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ed_ma61 | Mon, 28 July 2003 08:25 |
