Table of Contents
Are bronze valve guides worth it?
Yes bronze guides are worth it. If the heads are ported properly the guides have to be reomoved anyway. Bronze guides offer a tighter clearences and longer life .
What is the best material for valve guides?
Cast iron guides; use either standard road spec valves – preferably the up-rated, chrome-stemmed items for longevity – or race spec valves that have been chrome-stemmed.
How do you measure valve guide size?
You can use the gauge to measure each guide, or speed things up by setting the gauge to the valve guide maximum diameter and use it as a go, no-go gauge. Simply try the split ball gauge in each guide after setting it to size. If it enters the guide it is out of tolerance. NOTE: upon disassembly, keep valves in order.
How do I find valve guide taper?
To check guide wear (as well as taper) using a telescoping or split ball gauge, measure the guide ID at both ends and in the middle. Subtract the middle reading from the ends to determine taper wear.
What type of bronze is used for valve guides?
There have been several materials that are normally used for valve guides. Cast iron for small engines. Tin Bronze (North American UNS C90500, German CuSn10Zn, British G1) for piston airplane engines. Aluminum bronze (North American UNS C95400, German CuAI10Fe, British AB1) for high temperature applications.
What are bronze valve guides made from?
valve guides use a proprietary manganese bronze alloy that exhibits excellent thermal conductivity and wear characteristics – but that’s just the start. In an industry where the typical manganese bronze valve guide is around .
Do you have to ream new valve guides?
If your valves will fit in the new valve guides before you install them. Unless the bores they fit in are dirty or you warp them during installiation. they will not need reaming. I put them in the freezer and with a room temp head they require very little effort to install.
What are the methods used to repair a worn valve guide?
These methods include:
- Knurling.
- Installing thin-wall bronze guide liners.
- Replacing insert guides.
- Modifying the valve guide to accept oversize valve stems.
- Replacing integral guides with false guides.
- Installing BronzeWall 2 coil-type liners.
What are the methods to repair a worn valve guide?
These methods include:
- Knurling.
- Installing thin-wall bronze guide liners.
- Replacing insert guides.
- Modifying the valve guide to accept oversize valve stems.
- Replacing integral guides with false guides.
- Installing BronzeWall 2 coil-type liners.
Which valve guides will last the longest?
Cast iron guides work fine and are easy to install, last a long time, and may be clearanced with a reamer. Bronze guides require more clearance, must be clearanced with a hard stone wet hone (Sunnen type), and need to be installed by someone with MG specific experience and the proper equipment.