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| 90 degree V4 OHC |
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| dbvandy:
--- Quote from: Da_Kengineer_Meister on March 30, 2011, 01:44:16 AM ---Zowwie! :beer: This is coming along quickly! Very cool! Probably a dumb question to those who work on engines a lot but since I'm not one of those guys, I'll go ahead and ask. The four large circles at the front on the ends of the rods...? These circles are place holders that roughly represent pulleys for a serpentine timing belt that will keep all the cams synchronised? I'm guessing yes but thought to ask... --- End quote --- Exactly! I put a hole in some body washers just to get a feel for how it will look with the pulleys on the front. The real pulleys will be about an inch thick. It will be a toothed belt because timing is needed, the cams must turn 1/2 as much as the crank. I am divided on whether to go with a .080 pitch MXL belt like I did not the Otto, or a larger .200 pitch XL. The 200 will look beefier, so I might go that route. Doug |
| dkyfn:
Hi Doug, It is all a matter of how much force you want to transmit. 0.080 (MXL) is really light stuff. I use this with very small electric motors on my smaller projects and it can be over torqued pretty easily unless I implement velocity profiling. |
| dbvandy:
--- Quote from: dkyfn on March 31, 2011, 01:02:12 AM ---Hi Doug, It is all a matter of how much force you want to transmit. 0.080 (MXL) is really light stuff. I use this with very small electric motors on my smaller projects and it can be over torqued pretty easily unless I implement velocity profiling. --- End quote --- I used an .080 on the Otto engine and it seemed to work pretty well, driving the single cam did not seem to put too much torque on the belt. I will be driving 4 cams with this one with 8 contacts, so I think I will go for the beefier 3/8 inch wide XL which is .200 pitch. It is going to look like a blower belt... Doug |
| dbvandy:
Well, I tapped 31.5 of the 32 6-32 holes successfully yesterday for the cylinders, 4 for each head and 4 each to mount them to the block.... don't you just hate it when the tap grabs a chip all the way at the bottom of the hole and you hear that "crrreannnk" sound???? Bad words were said... ugh... Doug |
| Bernd:
Sorry to hear thar Doug. For a while ther I was wondering what 1/2 6-32 thread is. :palm: :doh: Then I realized reading further what you meant. :( Time for a little, what is it, alm or something of that sort to melt the tap out.? Bernd |
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