Any benefit in getting cams ground up?

[Stephan]

And one more point. Why falicon wheels? My cam gears have just filed holes for bolts holding the cams, it is practically the same. I have no doubt you can file them as well

[Varastorm]

And one more point. Why falicon wheels? My cam gears have just filed holes for bolts holding the cams, it is practically the same. I have no doubt you can file them as well

Hi Stephan, the Falicons & springs are new old stock & were cheapish for the UK. I just had to have them even though I might not use them or the springs.

As your more than likely finding out yourself, bits like these are getting harder & harder to source, so if they are in my budget I get them.

I feel that I can give a good home to any cam profile now & if I don't use them they go on eBay.

BTW, how is your bike doing with the new cams? Pros & cons etc..

[Stephan]

BTW, how is your bike doing with the new cams? Pros & cons etc..

feels like stock but stronger, no cons. As I said before, I cannot say how only cams change the bike as it was part of whole rebuilt. I just plan to finish fuelling using flo commander and some little experiment with open airbox. But this configuration is definitely working good.

[Varastorm]

Been reading about this sort of thing today.

Lots of guys did it back in the olde days.
We called them belly grinds.
You braced it against your belly while pushing it into the grinding wheel. Surprisingly some worked very well.

http://www.jalopyjournal.com/forum/thre ... ng.238822/

[sirch345]

Been reading about this sort of thing today.

Lots of guys did it back in the olde days.
We called them belly grinds.
You braced it against your belly while pushing it into the grinding wheel. Surprisingly some worked very well.

http://www.jalopyjournal.com/forum/thre ... ng.238822/

I like that It worked though according to your link

Chris.

[NZSpokes]

Just found a local crowd that can do the cams for $420 NZD for ground and $900 for a hardface job.

Hmmmmmm

[tony.mon]

There's no point leaving them unhardened, as the lobes wear and you end up back at stock lifts -or worse.
My Base circle grinds lasted less than two years before lift was same as stock.
Properly or not at all....

[NZSpokes]

There's no point leaving them unhardened, as the lobes wear and you end up back at stock lifts -or worse.
My Base circle grinds lasted less than two years before lift was same as stock.
Properly or not at all....

Righto, that answers that. Cheers

[NZSpokes]

Hmmm, can I harden the cams at home?

[Dendrob]

Hmmm, can I harden the cams at home?

Wouldn't case hardening be done before finish grinding?

[Dendrob]

By removing material off the base circle the valve is moved further in the same amount of time, therefore the valve acceleration rate is higher? Am I right there? How do the stock springs cope with this?

I'm just an inquisitive type, so please don't be offended. It's just a question out of interest.

Edit: the duration would also increase, yes?

[tony.mon]

By removing material off the base circle the valve is moved further in the same amount of time, therefore the valve acceleration rate is higher? Am I right there? How do the stock springs cope with this?

I'm just an inquisitive type, so please don't be offended. It's just a question out of interest.

Edit: the duration would also increase, yes?

Yes, the valve acceleration rate increases, but stock springs are good quality, and the Rev limit is quite low compared to il4's, so doesn't give problems.
I just used the original springs without problems, but to be sure you could use new ones. Stronger springs are available, but you lose some power using them.
You can alter the duration or lift or both.
A base circle grind allows up to ten degrees of additional duration, and then it's up to you whether you want to increase or decrease overlap.
If you increase lift I would think that an increase in duration would be a good idea, as it allows a slower ramp and more control of the valve, with less likelihood of valve bounce, but Benny Hedges ran some quite extreme cams with no valve bounce issues, it's on here somewhere and so worth a read to see what springs he used.
You won't be able to ask him, though. He died a while back.

[Dendrob]

By removing material off the base circle the valve is moved further in the same amount of time, therefore the valve acceleration rate is higher? Am I right there? How do the stock springs cope with this?

I'm just an inquisitive type, so please don't be offended. It's just a question out of interest.

Edit: the duration would also increase, yes?

Yes, the valve acceleration rate increases, but stock springs are good quality, and the Rev limit is quite low compared to il4's, so doesn't give problems.
I just used the original springs without problems, but to be sure you could use new ones. Stronger springs are available, but you lose some power using them.
You can alter the duration or lift or both.
A base circle grind allows up to ten degrees of additional duration, and then it's up to you whether you want to increase or decrease overlap.
If you increase lift I would think that an increase in duration would be a good idea, as it allows a slower ramp and more control of the valve, with less likelihood of valve bounce, but Benny Hedges ran some quite extreme cams with no valve bounce issues, it's on here somewhere and so worth a read to see what springs he used.
You won't be able to ask him, though. He died a while back.

Thanks Tony. Very interesting.

Sad end to your post.

[tony.mon]

By removing material off the base circle the valve is moved further in the same amount of time, therefore the valve acceleration rate is higher? Am I right there? How do the stock springs cope with this?

I'm just an inquisitive type, so please don't be offended. It's just a question out of interest.

Edit: the duration would also increase, yes?

Yes, the valve acceleration rate increases, but stock springs are good quality, and the Rev limit is quite low compared to il4's, so doesn't give problems.
I just used the original springs without problems, but to be sure you could use new ones. Stronger springs are available, but you lose some power using them.
You can alter the duration or lift or both.
A base circle grind allows up to ten degrees of additional duration, and then it's up to you whether you want to increase or decrease overlap.
If you increase lift I would think that an increase in duration would be a good idea, as it allows a slower ramp and more control of the valve, with less likelihood of valve bounce, but Benny Hedges ran some quite extreme cams with no valve bounce issues, it's on here somewhere and so worth a read to see what springs he used.
You won't be able to ask him, though. He died a while back.

Thanks Tony. Very interesting.

Sad end to your post.

Good funeral, though, if you can say that....
He had sold me those cams, I'd paid but was waiting for them to be posted. They went missing when he died, they're out there somewhere I suppose.

[Dendrob]

Perhaps with him in the ether.