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Title: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 19, 2020, 22:13:45 pm I’m in the process of setting up my 1.4 rockers but when I turn it over by hand the valve spring bind stopping the rotation.
If there is a decent web page for setting the rockers up please post up here, better still a YouTube video would be brill. Tia Mike Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: baz on August 19, 2020, 23:05:29 pm Use a light spring for set up. Adjustable pushrod spring fits well.
Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 19, 2020, 23:58:52 pm Just read that Baz, I’ll swop out the dual HD’s for a stock single I reckon. Although I think I’ve sussed it, piston had a mark on it when I stripped the head off, reckon the piston and valve are hitting each other.
FK8 cam and 1.4 rockers so a lot of lift Any ideas other than pocketing the piston tops? Thanks Baz Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: baz on August 20, 2020, 00:03:51 am Just read that Baz, I’ll swop out the dual HD’s for a stock single I reckon. Although I think I’ve sussed it, piston had a mark on it when I stripped the head off, reckon the piston and valve are hitting each other. FK8 cam and 1.4 rockers so a lot of lift Any ideas other than pocketing the piston tops? Thanks Baz Sent from my iPhone using Tapatalk I've similar lift and 1.4s and 0.4 deck, shouldn't hit unless your cam is indexed wrong. That's something I've done in the past :D Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 20, 2020, 06:25:37 am Just read that Baz, I’ll swop out the dual HD’s for a stock single I reckon. Although I think I’ve sussed it, piston had a mark on it when I stripped the head off, reckon the piston and valve are hitting each other. FK8 cam and 1.4 rockers so a lot of lift Any ideas other than pocketing the piston tops? Thanks Baz Sent from my iPhone using Tapatalk I've similar lift and 1.4s and 0.4 deck, shouldn't hit unless your cam is indexed wrong. That's something I've done in the past :D Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: baz on August 20, 2020, 06:49:50 am A zero missing in mine, should have said 0.040 inch or 1mm.
Your deck is 0.4mm? That seems too tight as 1mm generally recommended as minimum. Still shouldn't cause valves to hit though Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 20, 2020, 06:55:27 am A zero missing in mine, should have said 0.040 inch or 1mm. I’ve got a 1mm cylinder shim so think I’ll try that tonight to bring the deck up to 1.4mm deck and report back. I wanted to keep my CR up this shouldn’t affect it to much Your deck is 0.4mm? That seems too tight as 1mm generally recommended as minimum. Still shouldn't cause valves to hit though Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: richie on August 20, 2020, 07:24:19 am Mike
Baz is correct 0.4mm is to tight, but if it hits now even at 1.4mm it will be to close for valve to piston clearance, what heads are they and are they machined for compression? what cc in chamber? I have built quite a few engines with fk8 and 1.4 rockers and never had to notch pistons yet s makes me think something else is not quite right cheers Richie Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 20, 2020, 09:50:52 am Mike They’re CB Ultra mags I’ve bought used so don’t really know if they had work done, they’re 57cc as Ive measured. Baz is correct 0.4mm is to tight, but if it hits now even at 1.4mm it will be to close for valve to piston clearance, what heads are they and are they machined for compression? what cc in chamber? I have built quite a few engines with fk8 and 1.4 rockers and never had to notch pistons yet s makes me think something else is not quite right cheers Richie Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: baz on August 20, 2020, 11:46:25 am You certain cam is aligned correctly with cam gear? Dot to slot? And cam gear correctly aligned with crank?
Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 20, 2020, 12:00:31 pm You certain cam is aligned correctly with cam gear? Dot to slot? And cam gear correctly aligned with crank? Lots to double check this week I reckon Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 20, 2020, 22:06:31 pm Stripped it down here is how it’s set up, feel like there’s something blindingly obvious just not jumping out at me
(https://uploads.tapatalk-cdn.com/20200820/6819f1f6b1c0b419de25350a9fc69b93.jpg) (https://uploads.tapatalk-cdn.com/20200820/f6f7e13ddc98855c1aa173870c9176d2.jpg) (https://uploads.tapatalk-cdn.com/20200820/435b6310dd701922eaf7c6d090a1efe9.jpg) Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 20, 2020, 22:07:46 pm The crank gear only has that small mark but at 180 opposite sides of the gear if that’s relevant
Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Garrick Clark on August 21, 2020, 09:50:22 am Looks wrong. That crank cog mark isn't the 2 dots. There further round the cog and can be almost invisible
Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Garrick Clark on August 21, 2020, 09:51:17 am In fact. It's definitely wrong
Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Fastbrit on August 21, 2020, 10:28:40 am (https://www.cbperformance.com/v/vspfiles/photos/1399-2.jpg?v-cache=1579172617)
Note the single dot on the cam gear is in line with the slot in the end of the camshaft. Then note the two timing marks on the crank gear are directly opposite the slot for the Woodruff key. Also, you 'may' have installed the crank gear back to front, meaning the two dots are on the back and out of sight. In which case, you'll need to pull it off and turn it round... Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 21, 2020, 18:35:13 pm I’ll see if I can get a view for the dots on the crank gear from the rear, hope so it was a pig to get on. Crank had to go in the fridge for an hour to get it on, wife loved it 🤷🏼‍♂️
Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Garrick Clark on August 21, 2020, 18:46:11 pm You won't have to take that cog off. That dot in the above pic is on the same side as the 2 correct dots. I had to use an eye glass to see them as they are so poorly etched onto the cog
Title: Re: Rocker geometry set up, valve spring binding!!! Post by: baz on August 21, 2020, 18:47:32 pm I’ll see if I can get a view for the dots on the crank gear from the rear, hope so it was a pig to get on. Crank had to go in the fridge for an hour to get it on, wife loved it 🤷🏼‍♂️ Sent from my iPhone using Tapatalk Did you heat the gear or just freeze the crank? Heating the gear is easier. Title: Re: Rocker geometry set up, valve spring binding!!! Post by: baz on August 21, 2020, 18:49:03 pm I’ll see if I can get a view for the dots on the crank gear from the rear, hope so it was a pig to get on. Crank had to go in the fridge for an hour to get it on, wife loved it 🤷🏼‍♂️ Sent from my iPhone using Tapatalk Did you heat the gear or just freeze the crank? Heating the gear is easier. Finding the dots should be easy if you follow Keith's picture above. Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 21, 2020, 20:06:43 pm I’ll see if I can get a view for the dots on the crank gear from the rear, hope so it was a pig to get on. Crank had to go in the fridge for an hour to get it on, wife loved it 🤷🏼‍♂️ Sent from my iPhone using Tapatalk Did you heat the gear or just freeze the crank? Heating the gear is easier. Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 21, 2020, 20:07:58 pm You won't have to take that cog off. That dot in the above pic is on the same side as the 2 correct dots. I had to use an eye glass to see them as they are so poorly etched onto the cog (https://uploads.tapatalk-cdn.com/20200821/0f4d4dd90f588a726ff5571d35643e62.jpg)Found them, as you said they where so difficult to see Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 21, 2020, 20:11:33 pm Put back together in the correct order and hey presto!!! All good 🎉🎉
Thanks for the help guys Sent from my iPhone using Tapatalk Title: Re: Rocker geometry set up, valve spring binding!!! Post by: richie on August 22, 2020, 06:55:32 am Put back together in the correct order and hey presto!!! All good 🎉🎉 Thanks for the help guys Sent from my iPhone using Tapatalk 8) Title: Re: Rocker geometry set up, valve spring binding!!! Post by: Mike Cott on August 22, 2020, 11:35:20 am Put back together in the correct order and hey presto!!! All good 🎉🎉 Thanks for the help guys Sent from my iPhone using Tapatalk 8) Sent from my iPhone using Tapatalk |