d.p Posted July 24, 2021 Author Report Share Posted July 24, 2021 (edited) 2 minutes ago, Crashtd420 said: Maybe they used a 1/4 -20 helicoil so they didnt have to drill the hole to big for the helicoil..... I'd look up helicoils and see what size hole and threads are needed... already done. I replaced it with 1/4-20 heli-coil (got a kit from autozone) and it’s tight but expect it to back out when I take the cover off again. Edited July 24, 2021 by d.p 2 Quote Link to comment
Crashtd420 Posted July 24, 2021 Report Share Posted July 24, 2021 Just now, d.p said: already done. I replaced it with 1/4-20 heli-coil (got a kit from autozone) and it’s tight but expect it to back out when I take the cover off again. Just get some extras and call it good.... if it backs out use a new one.... Problem is you cant use a bigger bolt.... because of valve cover.... 1 Quote Link to comment
d.p Posted July 24, 2021 Author Report Share Posted July 24, 2021 Yeah I guess so. 2 Quote Link to comment
thisismatt Posted July 24, 2021 Report Share Posted July 24, 2021 https://www.mcmaster.com/90699A110/ M6 for a 3/8-16 hole 3 Quote Link to comment
Crashtd420 Posted July 24, 2021 Report Share Posted July 24, 2021 1 minute ago, thisismatt said: https://www.mcmaster.com/90699A110/ M6 for a 3/8-16 hole I just checked my head.... after all this I dont believe there is actually enough material to this type of repair.... you end up with next to nothing for side wall material.... Sadly helicoil might be the beat option....... 1 Quote Link to comment
thisismatt Posted July 24, 2021 Report Share Posted July 24, 2021 Time for a new motor 1 3 Quote Link to comment
thisismatt Posted July 24, 2021 Report Share Posted July 24, 2021 Or break out the tig 2 Quote Link to comment
d.p Posted July 24, 2021 Author Report Share Posted July 24, 2021 New head if anything. What’s the best l4 head for a street motor? 1 Quote Link to comment
d.p Posted July 24, 2021 Author Report Share Posted July 24, 2021 A87 closed chamber heads any good? 1 Quote Link to comment
Crashtd420 Posted July 24, 2021 Report Share Posted July 24, 2021 28 minutes ago, d.p said: A87 closed chamber heads any good? You dont need a new head because a helicoil valve cover bolt..... Remember closed chamber will increase compression ratio but not by alot.... What head do you have now? 2 Quote Link to comment
jbirds510 Posted July 24, 2021 Report Share Posted July 24, 2021 1 hour ago, d.p said: New head if anything. What’s the best l4 head for a street motor? U60 or U67 ported then port matched to intake. as far as hold down fasteners for the VC, I suggest swapping to all nut and stud. VW guys often use stepped studs for the final repair on oil sump screen plates. Me personally, id grind out the hole into a channel and tig in some new material, set the VC on to reference where to drill and tap. 1 1 Quote Link to comment
mainer311 Posted July 24, 2021 Report Share Posted July 24, 2021 Helicoils don’t just “pull out.” We put stainless helicoils into aluminum parts all the time when we know that the customer is going to be repeatedly installing/removing a thumbscrew/etc. 3 Quote Link to comment
d.p Posted July 24, 2021 Author Report Share Posted July 24, 2021 I have a U60 on it now so already the most desirable? And I know I don’t need a new head cause of that one bolt hole, I was being facetious. And @mainer311dont know what to tell you but the original one backed (not pulled) out and the new one I put it on backed out as well when I took the cover off. I just reinstalled it and will leave it alone. 3 Quote Link to comment
d.p Posted July 24, 2021 Author Report Share Posted July 24, 2021 U60 head from when I first got the engine. 2 Quote Link to comment
Crashtd420 Posted July 24, 2021 Report Share Posted July 24, 2021 26 minutes ago, d.p said: I have a U60 on it now so already the most desirable? And I know I don’t need a new head cause of that one bolt hole, I was being facetious. And @mainer311dont know what to tell you but the original one backed (not pulled) out and the new one I put it on backed out as well when I took the cover off. I just reinstalled it and will leave it alone. You never know with you..... And yes just leave it alone.... 2 Quote Link to comment
d.p Posted July 24, 2021 Author Report Share Posted July 24, 2021 Haha true. can anyone recommend a shifter boot? The one I got from eBay some years ago has seen better days. I wonder if I could just get one made? Anything got to be better than the Thailand rubber ones. 1 Quote Link to comment
datzenmike Posted July 24, 2021 Report Share Posted July 24, 2021 4 hours ago, d.p said: U60 head from when I first got the engine. Been milled down some. Measure from underside to valve cover surface.... should be 4.248" Loctite the helicoil in. 2 Quote Link to comment
mainer311 Posted July 24, 2021 Report Share Posted July 24, 2021 The fact that it was milled to the letters says a lot. 2 Quote Link to comment
jbirds510 Posted July 25, 2021 Report Share Posted July 25, 2021 3 hours ago, mainer311 said: The fact that it was milled to the letters says a lot. might be a real squeezer 1 Quote Link to comment
d.p Posted July 25, 2021 Author Report Share Posted July 25, 2021 Engine runs strong and pulls hard even with a milled down head. 5 Quote Link to comment
datzenmike Posted July 25, 2021 Report Share Posted July 25, 2021 The cut is slicing through the letters. A 1mm slice (0.040") would up the compression to 9.08 (stock is 8.4).... that's not impossible to do or live with. You can run regular gas with that if the timing is right. 2 Quote Link to comment
d.p Posted July 25, 2021 Author Report Share Posted July 25, 2021 11 hours ago, datzenmike said: The cut is slicing through the letters. A 1mm slice (0.040") would up the compression to 9.08 (stock is 8.4).... that's not impossible to do or live with. You can run regular gas with that if the timing is right. I run premium with this motor. Ran regular with the stock l16. 2 Quote Link to comment
datzenmike Posted July 25, 2021 Report Share Posted July 25, 2021 Good. Higher compression extracts the most energy from the fuel but at the risk of detonation. Higher octane will allow you to do this more safely. Maybe it pinged a little? so you increased the octane? 2 Quote Link to comment
Stoffregen Motorsports Posted July 25, 2021 Report Share Posted July 25, 2021 Core shift happens and I've seen stock, uncut heads with casting numbers cut off at the bottom, so relying on that is not an accurate measure of CR. As we've discussed before, the cam has a lot to do with how much timing and what type of fuel you need to use. I had a 2200 in my first 510 which had 11:1 and ran on pump gas with 28 degrees of timing. Eventually we installed cut down KA24DE pistons to lower the CR to just over 10:1, and installed a smaller cam. After those mods, it dyno'd at 210hp. 2 Quote Link to comment
datzenmike Posted July 25, 2021 Report Share Posted July 25, 2021 Only meant it might indicate milling. Amount is anyone's guess, like how long is a piece of string? Again the stock thickness from gasket to gasket is 4.248" 2 Quote Link to comment
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