Topic: Missing horsepower

[SunLar]

Thanks Mike
the tool i used for messuring is not a precise tool, just giving me a compression reading on each cylinder.
I can see this leak down tool is very helpful.
I'm almost sure now, my timing is not correct, almost 10 degree off on a quick messure.
Have to work on that


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Yes....bad cam timing will have a very bad effect on performance. I know through past experience. We all need experience to become better.

exactly! First engine build, but what a journey

[SunLar]

I runned old RC 836 that have a dome that fits the head with widened chamber. Old style to open chambers and have pistons with wider domes.

- Cam timing correct? I timed my SS-1 cam IN: 22/55, EX: 56/24 @ 1mm lift and 0 lift (measured total lift was 9.18mm IN and EX). I tightened the valve adjuster screw until the valve started to lift (needle moved 0.01-0.02 mm) to remove all play.
- Really too rich with higher throttle lift?
- You have pods?
- Do you have an A/F measurement when running the Dyno? My dyno chart has it when a sensor was sticked into the exhaust. Measured at WOT.
I had 132.5 main when that dyno was done. I changed cam to RC295 copy and 135 gave more torque when twisting throttle on 5:th gear from 80-90km/h.

I reduced the acc pump stroke later on, to min setting. I checked the floats before and reduced carb 1-2. I saw this summer that cyl 1-2 ran extra lean close to damage and $$$$.


I have purchased 3 more clear tube tube tools (VM29 tools) so I can check all 4 at the same time. Wego III Air/fuel sensor kit is under shipping, here next week. I'll check all cylinders one by one next year. Sensor in a sniffer pipe to be mounted into the exhaust. Measure during normal driving, not only WOT. It will cost a lot if it runs too lean at 100-120km/h and pistons will melt. The throttles are not much opened at that range.

I secured the carbs in frame when it's not good have them hanging and bouncing up-down in carb boots only. Thick strap and rubber hose against frame secure the rack

Is your cam timing according to Action Fours specification chart that you previous sent to me?

[PeWe]

I runned old RC 836 that have a dome that fits the head with widened chamber. Old style to open chambers and have pistons with wider domes.

- Cam timing correct? I timed my SS-1 cam IN: 22/55, EX: 56/24 @ 1mm lift and 0 lift (measured total lift was 9.18mm IN and EX). I tightened the valve adjuster screw until the valve started to lift (needle moved 0.01-0.02 mm) to remove all play.
- Really too rich with higher throttle lift?
- You have pods?
- Do you have an A/F measurement when running the Dyno? My dyno chart has it when a sensor was sticked into the exhaust. Measured at WOT.
I had 132.5 main when that dyno was done. I changed cam to RC295 copy and 135 gave more torque when twisting throttle on 5:th gear from 80-90km/h.

I reduced the acc pump stroke later on, to min setting. I checked the floats before and reduced carb 1-2. I saw this summer that cyl 1-2 ran extra lean close to damage and $$$$.


I have purchased 3 more clear tube tube tools (VM29 tools) so I can check all 4 at the same time. Wego III Air/fuel sensor kit is under shipping, here next week. I'll check all cylinders one by one next year. Sensor in a sniffer pipe to be mounted into the exhaust. Measure during normal driving, not only WOT. It will cost a lot if it runs too lean at 100-120km/h and pistons will melt. The throttles are not much opened at that range.

I secured the carbs in frame when it's not good have them hanging and bouncing up-down in carb boots only. Thick strap and rubber hose against frame secure the rack

Is your cam timing according to Action Fours specification chart that you previous sent to me?

Action fours numbers  are not real when timing the cam. (total lift was correct, even a little bit more. 0.361, spec .360"
28/62, 62/28 probably total lift. When valve start to lift and when closed completely
I  measured at 1mm lift (0.04"). So cam timed as specified with almost "mirrored" open/close times, same lobe centers. Advance or retartard a few degrees possible.  Maybe 2-3 degrees advanced to gett more from low, but less at 9000-9500 rpm