Author Topic: Loss of Compression While Riding  (Read 1497 times)

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cyrusb

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Reply #30 on: November 22, 2019, 12:48:33 PM
The Neway cutters very accurately cut your 3 angles. You do it by hand with a T bar, so it happens under control. Google it, you'll see the system. The kit is around $350, so I do not personally own one. But I bring my heads to someone who does.There is also no lapping when your seats are done this way. That grey finish that grinding and lapping produce are microscopic pits that form the nuclei of the larger pits to come.
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Adrian II

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cyrusb

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Reply #32 on: November 22, 2019, 06:23:20 PM
Holy cow! those are expensive! The sets I saw were on eBay and were $400 to $600 range. They also were not bike specific. My pals set can do air cooled vw's to Shovelheads. I believe it will fit the bullet also. But certainly not the multivalve engine valve sizes.
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ddavidv

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Reply #33 on: November 26, 2019, 01:27:49 PM
Not to be a contrarian, but hand lapping valves was common back in the day these engines were designed. Why can't one still do it today?
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Adrian II

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Reply #34 on: November 26, 2019, 03:18:07 PM
You still can, just that some modern methods claim to be better.

A.
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cyrusb

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Reply #35 on: November 26, 2019, 07:41:39 PM
Have you ever noticed that most engines almost never need valve jobs anymore? Most engines go to the junkyard with the original heads, and that is with a shitload of miles on them. This was not always the case. That is the difference between the old way and the new way(no pun intended). When you cut a valve seat as opposed to grinding you leave a polished surface that is  less likely to burn. But as mentioned lapping still works and is cost effective.
« Last Edit: November 26, 2019, 08:22:53 PM by cyrusb »
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ace.cafe

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Reply #36 on: November 26, 2019, 10:00:26 PM
All the top quality valve seat machines today use cutters, not grinding stones.
They have cutters with multiple angles for flow, besides the seat contact angle, and they are all cut at the same time with these cutters.

All the Fireballs and heads we have done had seats done with these types of multi-angle cutters.
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ddavidv

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Reply #37 on: November 27, 2019, 01:06:32 PM
I don't doubt cutting is superior. It just seemed like we were dismissing home grinding as something that shouldn't be done.

We don't do valve jobs anymore on modern vehicles for a myriad of reasons. Different fuel, better oil sealing and significantly better metallurgy--particularly compared to that on Iron Barrel Enfields.
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ace.cafe

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Reply #38 on: November 27, 2019, 02:08:11 PM
I don't doubt cutting is superior. It just seemed like we were dismissing home grinding as something that shouldn't be done.

We don't do valve jobs anymore on modern vehicles for a myriad of reasons. Different fuel, better oil sealing and significantly better metallurgy--particularly compared to that on Iron Barrel Enfields.

You can stilll use stones if desired.
Especially if you need to do stuff at home.
But, the state of the art for commercial valve jobs has moved on.
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axman88

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Reply #39 on: November 27, 2019, 05:37:14 PM
Have you ever noticed that most engines almost never need valve jobs anymore?

And what manufacturer puts periodic de-carbonization into their maintenance schedule, other than two strokes and Royal Enfields?


cyrusb

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Reply #40 on: November 27, 2019, 05:55:40 PM
I don't doubt cutting is superior. It just seemed like we were dismissing home grinding as something that shouldn't be done.

We don't do valve jobs anymore on modern vehicles for a myriad of reasons. Different fuel, better oil sealing and significantly better metallurgy--particularly compared to that on Iron Barrel Enfields.
  Grind away if that is what you want to do. As mentioned earlier it works and is cost effective. But when it comes to burning valves, the fuel now has no lead (bad news for valves) , Stellite is still Stellite,and Stainless steel is still stainless steel. It's just a tip, you are free to do what you like. 
2005E Fixed and or Replaced: ignition, fenders,chainguard,wires,carb,headlight,seat,tailight,sprockets,chain,shocks,fork springs, exhaust system, horn,shifter,clutch arm, trafficators.