High comp KA

[Uniac]

ok here’s what i’ve been up to, i’ll let the cat out of the bag.

I built a 13.7:1 Ka, It runs on 94 and toluene. 11lbs flywheel, sohc pistons, ported head, molly rings, the best bearings i could buy, lightweight pullies, custom 3" exhuast, s&s headers, stainless valves, twin exhuast cams, msd coil, msd 6a to come soon, etc etc etc.

Now here’s the problem, it’ll “fire” but won’t start. timing is being a pain, any idea’s would be great…see you at the track next season…i hope your sr’s are healthy

[spite]

What kind of ignition do you have? You’ll need something pretty beefy to get a clean spark in at that compression.

Also, I’m relatively certain that 13.7:1 is over what 94 octane can handle. Say hello to leaded race fuel and goodbye to your cat and 100k sparkplugs

[Racer_XTREME]

Matt, does this mean you’re not coming over today?

[dnash]

@lucky DFR

ok here’s what i’ve been up to, i’ll let the cat out of the bag.

I built a 13.7:1 Ka, It runs on 94 and toluene. 11lbs flywheel, sohc pistons, ported head, molly rings, the best bearings i could buy, lightweight pullies, custom 3" exhuast, s&s headers, stainless valves, twin exhuast cams, msd coil, msd 6a to come soon, etc etc etc.

Now here’s the problem, it’ll “fire” but won’t start. timing is being a pain, any idea’s would be great…see you at the track next season…i hope your sr’s are healthy

I thought you said it [b]runs[b\] on 94 and toluene? 8)

Try using more toluene.

[Uniac]

@spite

What kind of ignition do you have? You’ll need something pretty beefy to get a clean spark in at that compression.

Also, I’m relatively certain that 13.7:1 is over what 94 octane can handle. Say hello to leaded race fuel and goodbye to your cat and 100k sparkplugs

i run 99 octane if you must know, i mix it myself, to abd i can’t buy the stuff over the couter nemore as of today.

[Uniac]

@dnash

[quote=lucky DFR]ok here’s what i’ve been up to, i’ll let the cat out of the bag.

I built a 13.7:1 Ka, It runs on 94 and toluene. 11lbs flywheel, sohc pistons, ported head, molly rings, the best bearings i could buy, lightweight pullies, custom 3" exhuast, s&s headers, stainless valves, twin exhuast cams, msd coil, msd 6a to come soon, etc etc etc.

Now here’s the problem, it’ll “fire” but won’t start. timing is being a pain, any idea’s would be great…see you at the track next season…i hope your sr’s are healthy

I thought you said it [b]runs[b\] on 94 and toluene? 8)

Try using more toluene.[/quote]

heh, you know what i mean.

[mr200]

yeah … race fuel only.

How did you calculate the CR? Is that really the true compression?

Hope you’ve got a really really good cooling system.

I run an 11.5:1 (true compression) in the Charger, and even at those levels pump gas is only Sunoco.

You likely need a gear reduction starter. Your factory starter isn’t strong enough to get the motor fired up.

I’d like to see more of the cat and less of the bag

How did you get almost 14:1 with SOHC pistons? Hehehe … that would be a lot of milling.

[Mishkin_240]

Did you gap the spark plugs? If so how small did you go? Stock is 1-1.1mm /.40 IIRC. Maybe you need to make the gap smaller with all that pressure. Although I can’t say I can recommend a setting.

[Uniac]

you’ll see the car at the track in the spring, it’s sleeping for a ;lil while

the plugs are gapped at .040" like stock, i think they’re fouled, oh well, just autolites…and the starter seems to have no trouble turning the motor over…but i think a big desil battery may be required to keep the juice flowing.

@mr200

yeah … race fuel only.

How did you calculate the CR? Is that really the true compression?

Hope you’ve got a really really good cooling system.

I run an 11.5:1 (true compression) in the Charger, and even at those levels pump gas is only Sunoco.

You likely need a gear reduction starter. Your factory starter isn’t strong enough to get the motor fired up.

I’d like to see more of the cat and less of the bag

How did you get almost 14:1 with SOHC pistons? Hehehe … that would be a lot of milling.

[nocwage]

i have a friend who built a Hybrid B20 w/ b16a head motor, he set it up with 11.5:1 compression pistons and the stock starter could BARELY get it going.

I’m surprised you can turn it over at all!
Hooray for beefy nissans!