# High comp KA **URL:** \ **Category:** SON240sx Automotive\ **Created:** [October 1, 2004, 1:05pm UTC](https://forums.speedlife.net/t/high-comp-ka/81701 "2004-10-01T13:05:10Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Uniac](https://avatars.discourse-cdn.com/v4/letter/u/34f0e0/32.png) [@Uniac](https://forums.speedlife.net/u/Uniac)\ **Post date:** [October 1, 2004, 1:05pm UTC](https://forums.speedlife.net/t/high-comp-ka/81701/1 "2004-10-01T13:05:10Z")
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 😛 ---
**Author:** ![spite](https://avatars.discourse-cdn.com/v4/letter/s/76d3ee/32.png) [@spite](https://forums.speedlife.net/u/spite)\ **Post date:** [October 1, 2004, 3:20pm UTC](https://forums.speedlife.net/t/high-comp-ka/81701/2 "2004-10-01T15:20:23Z")
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 🙂 ---
**Author:** ![Racer\_XTREME](https://avatars.discourse-cdn.com/v4/letter/r/e47c2d/32.png) [@Racer\_XTREME](https://forums.speedlife.net/u/Racer_XTREME)\ **Post date:** [October 1, 2004, 3:32pm UTC](https://forums.speedlife.net/t/high-comp-ka/81701/3 "2004-10-01T15:32:33Z")
Matt, does this mean you’re not coming over today? ---
**Author:** ![dnash](https://avatars.discourse-cdn.com/v4/letter/d/f6c823/32.png) [@dnash](https://forums.speedlife.net/u/dnash)\ **Post date:** [October 1, 2004, 3:33pm UTC](https://forums.speedlife.net/t/high-comp-ka/81701/4 "2004-10-01T15:33:40Z")
> [@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. ---
**Author:** ![Uniac](https://avatars.discourse-cdn.com/v4/letter/u/34f0e0/32.png) [@Uniac](https://forums.speedlife.net/u/Uniac)\ **Post date:** [October 1, 2004, 4:11pm UTC](https://forums.speedlife.net/t/high-comp-ka/81701/5 "2004-10-01T16:11:52Z")
> [@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. ---
**Author:** ![Uniac](https://avatars.discourse-cdn.com/v4/letter/u/34f0e0/32.png) [@Uniac](https://forums.speedlife.net/u/Uniac)\ **Post date:** [October 1, 2004, 4:14pm UTC](https://forums.speedlife.net/t/high-comp-ka/81701/6 "2004-10-01T16:14:19Z")
> [@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. ---
**Author:** ![mr200](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mr200/32/5495_2.png) [@mr200](https://forums.speedlife.net/u/mr200)\ **Post date:** [October 14, 2004, 9:41am UTC](https://forums.speedlife.net/t/high-comp-ka/81701/7 "2004-10-14T09:41:57Z")
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. ---
**Author:** ![Mishkin\_240](https://avatars.discourse-cdn.com/v4/letter/m/c37758/32.png) [@Mishkin\_240](https://forums.speedlife.net/u/Mishkin_240)\ **Post date:** [October 14, 2004, 11:25am UTC](https://forums.speedlife.net/t/high-comp-ka/81701/8 "2004-10-14T11:25:20Z")
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. ---
**Author:** ![Uniac](https://avatars.discourse-cdn.com/v4/letter/u/34f0e0/32.png) [@Uniac](https://forums.speedlife.net/u/Uniac)\ **Post date:** [October 14, 2004, 4:02pm UTC](https://forums.speedlife.net/t/high-comp-ka/81701/9 "2004-10-14T16:02:11Z")
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. ---
**Author:** ![nocwage](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nocwage/32/5489_2.png) [@nocwage](https://forums.speedlife.net/u/nocwage)\ **Post date:** [October 14, 2004, 4:22pm UTC](https://forums.speedlife.net/t/high-comp-ka/81701/10 "2004-10-14T16:22:20Z")
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!