Tool to thin valve guide boss?
Thread Starter
Melting Slicks
Joined: Jun 2016
Posts: 2,979
Likes: 332
From: Woodinville WA
Update: The BEAM cutter worked wonderfully! I did the first set of exhaust guide's last night. I just trimmed them down to 2" total length. Not sure why they said they'd only work on up to 0.500"; it worked brilliantly on my 0.530" OD guides!
I need to do the other set of heads this weekend and then thin the OD down at the top with my carbide; I got an 11/32" 240 grit flex hone for like $15 to get rid of any sharp burrs and to potentially remove a tiny bit of material from a few guides that are freakishly tight.
-The pilot on the BEAM cutter really didn't want to go into the guide on most of the super tight guides (I think the pilot is literally 11/32" OD ) -I put the pilot in the freezer for a while and that worked to make it easy to go in the first guide but then it heated up and was a bit more difficult on the latter guides.
Like an idiot, I was wearing sandals and had a super hot bronze shaving fling itself right between two of my toes- that made for an exciting evening!
Adam
I need to do the other set of heads this weekend and then thin the OD down at the top with my carbide; I got an 11/32" 240 grit flex hone for like $15 to get rid of any sharp burrs and to potentially remove a tiny bit of material from a few guides that are freakishly tight.
-The pilot on the BEAM cutter really didn't want to go into the guide on most of the super tight guides (I think the pilot is literally 11/32" OD ) -I put the pilot in the freezer for a while and that worked to make it easy to go in the first guide but then it heated up and was a bit more difficult on the latter guides.
Like an idiot, I was wearing sandals and had a super hot bronze shaving fling itself right between two of my toes- that made for an exciting evening!
Adam
Thread Starter
Melting Slicks
Joined: Jun 2016
Posts: 2,979
Likes: 332
From: Woodinville WA
Crud!
I cut the next three exhaust guides successfully and then while removing the cutter it broke- shockingly easily; I really can’t comprehend why.
I used my thinnest carbide to thin the top of the remainder of the guides and I’m pretty happy with the results; I used the carbide super lightly to camfer the inner edge of the guides- I know they’re supposed to be chamfered and I didn’t have another tool to do it. I’m pretty happy with the results.
I contacted BEAM about the guide cutter but I assume they provide no warranty on the China cutter and I’m going to have to buy a new one.
My 11/32” flex hone tool arrives this week and I’ll give each guide 2 or 3 passes to smooth out the inside and add cross hatches and I’m officially done with my heads other than cleaning and assembly. I’m going to keep the valves that I have now that trimming the guides has escalated in cost.
Next rebuild I’ll upgrade valves and maybe do a DIY thermal barrier coating on the exhaust ports. (I’m running so close to detonation with this build that I don’t dare put a thermal barrier coating on the combustion chambers.)
Adam
I cut the next three exhaust guides successfully and then while removing the cutter it broke- shockingly easily; I really can’t comprehend why.
I used my thinnest carbide to thin the top of the remainder of the guides and I’m pretty happy with the results; I used the carbide super lightly to camfer the inner edge of the guides- I know they’re supposed to be chamfered and I didn’t have another tool to do it. I’m pretty happy with the results.
I contacted BEAM about the guide cutter but I assume they provide no warranty on the China cutter and I’m going to have to buy a new one.
My 11/32” flex hone tool arrives this week and I’ll give each guide 2 or 3 passes to smooth out the inside and add cross hatches and I’m officially done with my heads other than cleaning and assembly. I’m going to keep the valves that I have now that trimming the guides has escalated in cost.
Next rebuild I’ll upgrade valves and maybe do a DIY thermal barrier coating on the exhaust ports. (I’m running so close to detonation with this build that I don’t dare put a thermal barrier coating on the combustion chambers.)
Adam
