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Post by gugne on Dec 11, 2019 10:30:39 GMT
After doing full restorations on a 78 Primmy, a 67 Nuova and an ET3 I felt it was time to build a quick one. Not crazy quick but something over 15bhp. This is the frame it's going into Spare wheel is coming off and I've a runner kit for the floor. Sip speedo already fitted and I might upgrade the shocks. The current ones are new but standard. My engine kit is the following: VMC Pro Cup 3 VMC Pipe Pinasco anticipated crank (20) Polini 24 carb and inlet VMC Fly and stator VMC Short 4th DRT 27/69 Primary VTR reinforced cruciform Crimaz Easy clutch with newfren corks and Crimaz woodruffs plus all the correct bearings, gaskets and oil seals naturally. It'll be my first time porting a casing plus I have to cut the fly cover slightly so the head will fit so expect a massive cock up.
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Post by triffid on Dec 11, 2019 17:53:09 GMT
Solid base, keep us all informed with lots of piccies
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Post by tzsteve on Dec 11, 2019 18:42:28 GMT
a nice little list of components just what you need
you may find that you need to skim the gasket face on the case so that you can more easily blend the transfers what carb are you using? 30mm?
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Post by gugne on Dec 12, 2019 11:23:14 GMT
a nice little list of components just what you need you may find that you need to skim the gasket face on the case so that you can more easily blend the transfers what carb are you using? 30mm? Thanks. That's a relief. I was waiting for a post from someone saying "oh that bit won't work with that bit". Skimming!!!! I don't have the skills or equipment to do that I'm afraid. Porting is going to be hard enough for me. If I don't blend it I realise I won't get the full potential of the kit but will it affect it much? I'm not looking for an out and out race engine just more of a sports touring thing. I have a Polini 24 carb because I bought it for my other Primmy as the 19 on it was playing up. Instead I used the 19 off this one and it's running fine now so i had the 24 spare. Will it work ok?
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Post by madmax on Dec 12, 2019 11:32:42 GMT
Hi Dom?
The carb will be ok, but make sure is set up correctly. Skimming the top of the casings will help with your blending in, all it needs is 1mm taken off and a good engineering firm should be able to do that for you.
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Post by gugne on Dec 12, 2019 12:36:02 GMT
Hi Dom? The carb will be ok, but make sure is set up correctly. Skimming the top of the casings will help with your blending in, all it needs is 1mm taken off and a good engineering firm should be able to do that for you. Hello mate! Any ideas where to start with the carb settings? If I don't skim the casings how much difference will it make? Thanks
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Post by tzsteve on Dec 12, 2019 21:39:34 GMT
have a look at the transfers on the case and then look at the transfers on the barrel skimming the case will enable you to double the size of the transfers look at the transfers on the cylinder then compare them to those tiny ports on the case the cylinder can produce 15 ish bhp with little problem those tiny transfers on the case are designed to work with a 5 bhp cylinder
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Post by gugne on Dec 13, 2019 10:17:27 GMT
have a look at the transfers on the case and then look at the transfers on the barrel skimming the case will enable you to double the size of the transfers look at the transfers on the cylinder then compare them to those tiny ports on the case the cylinder can produce 15 ish bhp with little problem those tiny transfers on the case are designed to work with a 5 bhp cylinder I'm not confusing skimming with porting am I? Skimming would be flat horizontally across the top of the casings whereas porting would be opening the transfers out towards the outer casing walls yes? That would be the bits of casing that are showing inside the gasket. Anyway I removed the "mezzaluna" from the casings which was stopping the cylinder dropping down onto the casings. Is that any good? Or am I shit at this?
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Post by gugne on Dec 13, 2019 16:54:11 GMT
Is it THAT shit that nobody will comment? I don't mind whatever you say as long as you can help me improve.
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Post by henri on Dec 13, 2019 17:26:47 GMT
nothing wrong with that .H
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Post by tzsteve on Dec 13, 2019 19:00:00 GMT
that's it mate horizontal across the gasket face although you can do a bit of a blend without skimming the case once you do skim the gasket face you will have more scope for opening out the transfers on the barrel and the case and you will still have loads of metal left to seal the gasket
if you just blend now to what you have how much of a sealing face will you have
the skimming is normally done on a milling machine and the cost is normally about £30 to £50 depending how greedy the engineer is
a note of caution be careful not to break through the case when blending ……….. its easily done
there must be someone here with recent photos of their work my photos are mostly deleted
those case halves look like they cake from two engines so skimming could be useful in any case
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Post by gugne on Dec 14, 2019 9:29:02 GMT
nothing wrong with that .H Thanks. That is top praise coming from someone like you.
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Post by gugne on Dec 14, 2019 9:36:02 GMT
that's it mate horizontal across the gasket face although you can do a bit of a blend without skimming the case once you do skim the gasket face you will have more scope for opening out the transfers on the barrel and the case and you will still have loads of metal left to seal the gasket if you just blend now to what you have how much of a sealing face will you have the skimming is normally done on a milling machine and the cost is normally about £30 to £50 depending how greedy the engineer is a note of caution be careful not to break through the case when blending ……….. its easily done there must be someone here with recent photos of their work my photos are mostly deleted those case halves look like they cake from two engines so skimming could be useful in any case Ok. Before I think about skimming I'll try some light blending and then show all of you the results and then go from there. As regards the casings, they are two different halves because I picked up one wrong half for the photo. I have two pairs of matched casings, one Vma1m and one Vma2m. I'll be using the VMA2M for this. If I break through the casings Henri said he'd fix it. If anyone has photos of blending etc please feel free to post them. Thanks again everyone.
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Post by gugne on Dec 16, 2019 10:06:41 GMT
Just checking before I start Dremelling. I'm going to start with the bits I've outlined in red. Am I right? Obviously I'll draw around the gasket to give me some guide from above. Once I've done them on Thursday I'll come back and post the results for any comments.
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Post by dazzz on Dec 17, 2019 17:41:53 GMT
that's it mate horizontal across the gasket face although you can do a bit of a blend without skimming the case once you do skim the gasket face you will have more scope for opening out the transfers on the barrel and the case and you will still have loads of metal left to seal the gasket if you just blend now to what you have how much of a sealing face will you have the skimming is normally done on a milling machine and the cost is normally about £30 to £50 depending how greedy the engineer is a note of caution be careful not to break through the case when blending ……….. its easily done there must be someone here with recent photos of their work my photos are mostly deleted those case halves look like they cake from two engines so skimming could be useful in any case
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Post by dazzz on Dec 17, 2019 17:42:35 GMT
That’s my Pro Cup transfers ^
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Post by gugne on Dec 18, 2019 11:28:48 GMT
That’s my Pro Cup transfers ^ Wow! Mine are going to look shit compared to those. Is that a standard casing or has it been welded/ (decked?) or had anything added to it?
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Post by dazzz on Dec 18, 2019 17:07:11 GMT
No they are standard original cases , I had them done professionally though , I also had the sealing pad opened out and manifold blended.
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Post by tzsteve on Dec 18, 2019 18:47:08 GMT
very neat and the inlet makes a lot of difference my last blow up and repair is here
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Post by gugne on Dec 19, 2019 9:54:58 GMT
No they are standard original cases , I had them done professionally though , I also had the sealing pad opened out and manifold blended. Ah, professionally, that gives me a little leeway then. I'm only running a 24 carb. I've checked the manifold gasket against the inlet and it seems the same size so I might not have to touch it. Anyway, it's D-Day (Dremel day) today so I'll post photos of the cock-up tomorrow. Henri, expect a parcel of fvcked casings soon.
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