#421  
Old 04-14-2024, 07:57 PM
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TheSilverBuick TheSilverBuick is offline
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12-15 psi.

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"How I learned to stop worrying and love the OHC Pontiac L6"



The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)

1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
  #422  
Old 05-15-2024, 05:46 PM
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I've cleaned up the hot side a bit, repainted it with very high temp paint and re-wrapped it. I haven't done the cross over pipe yet as I may re-do that one entirely.


On Facebook there were some questions on valvetrain follower tolerances, so I finally did what I had wanted to for a while and cut up a cam housing and cam to see exactly what is going on under the cam house. I have a housing that literally was pulled out of a garden bed and a 1bbl camshaft that has a few flatten lobes that could be used.




For the measurements I was looking for, I pulled the check balls out of the lash adjusters to make sure I could easily compress the adjuster.


Basically questions were around the tolerances of the thickness of some aftermarket cam followers versus GM. In my case, every follower I had was the same.


The base circle of the cam compressed the lash adjuster 0.10". The lash adjuster would bottom out if the follower was another 0.057" thicker (or base circle was bigger for some reason). I suspect this is why the valve stem heights need to be within 0.025" tolerance, to still allow the lash adjuster to have some range to work if it was on the high side.


Here is a video rotating the cam. The lash adjuster in operations should not compress, and you can see how much of the follower contacts the cam on the ramp up and down.
https://youtu.be/kuCSJbVflyQ?si=a5p4oRtgj7szL0mi


I don't plan on converting to a manual transmission yet, but I figure eventually I will, so bought a used scatter shield for a Magnum T-56 I have. The problem with the OHC engine is its a deep skirt block, so the starter sits lower than the typical BOP.




Here you can see how much offset it there is from a normal BOP bellhousing.


I know I'll have to cut the scatter shield to clear the starter, but it was mentioned I might get away without cutting using a mini starter that doesn't have a nose cone. Well almost. Still would have to clearance the block plate and scatter shield, but would be much less trimming than a nose coned starter. I have a while to decide which way I'll go.







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"How I learned to stop worrying and love the OHC Pontiac L6"



The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)

1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
  #423  
Old 05-15-2024, 11:28 PM
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Did a little work on the hood tach update. A long while back I epoxied the inside of it up because the plastic is pretty degraded and flaking. I also put iron sleeves around the threaded stands, filled them with epoxy, drilled and tapped new threads into them.

I made a panel out of sheet plastic to hold the digital tach screen and red and orange lights. I'll use the lights as warning indicators for the EFI. Overheating, low oil pressure, lean condition under load, or as shift lights.



I took the boat tach out of its housing entirely. There is a settings button on the top of the tach that I'm looking at soldering some wires on to and mounting a remote button on the bottom of the hood tach assembly so I can adjust the redline, etc on the tach.




All assembled and I checked that it still powers up.


I may get some black vinyl and cover over the sides and Chinese writing on the screen. Just leave the actual bar gauge and rpm numbers visible.


Here is the video of my proof of concept from a few months ago.
https://youtu.be/LJDj-_oQey4?si=xkJm6lxPFMjG5TUd

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"How I learned to stop worrying and love the OHC Pontiac L6"



The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)

1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
  #424  
Old 05-17-2024, 12:51 PM
Cammer-6 Cammer-6 is offline
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I see Im not the only one to hack up an otherwise useless housing and cam.
Tom Langdon modified his lash adjusters to be manual,so cut access windows into housing

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  #425  
Old 05-17-2024, 12:52 PM
Cammer-6 Cammer-6 is offline
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I see Im not the only one to hack up an otherwise useless housing and cam.
Tom Langdon modified his lash adjusters to be manual,so cut access windows into housing


Another thought is to use the smaller Atlas lash adjuster and offset it in bore to gain a higher than 1.5:1 ratio

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  #426  
Old 05-17-2024, 03:40 PM
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Atlas lash adjusters? I've got a few Pinto 2.3L ones, maybe a roller one Pinto one as well and just remembered I have a few experimental Prima-Tech roller ones, but a steel roller is very likely to eat the cast cam.

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The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)

1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
  #427  
Old 05-23-2024, 04:43 PM
Cammer-6 Cammer-6 is offline
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steel roller requires a billet cam from what Im told by Crane.

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  #428  
Old 05-23-2024, 10:46 PM
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I've been told the same, plus when the 2.3L Ford engine went from slider to roller they changed to a harder cam core, though there are a few people posting supposedly tens of thousands of miles of running rollers on their cast slider cams without issue. The lobe profiles aren't optimized for that though.

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The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)

1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
  #429  
Old 05-28-2024, 03:22 PM
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Started filling up the engine bay some more and got the hood installed! I still have to sort out the cooling system changes and external oil lines, then I'll get to the wiring.

I have the EGT probes in place and most the hot side in. I haven't installed the exhaust cross under pipes yet, and still need to see if they clear the oil pan with the 1/2" spacer installed.




No changes here.


Exhaust of the front three and rear three cylinders are still kept separate all the way to the turbo, and merge at the turbo and waste gate.




Since I put the hood on, I thought I'd take a look at setting the hood tach on the hood. I haven't bolted any of the hood tach parts together. Visibility is a little better than the camera shows but I think I'm going to try either a polarized or anti-glare screen on it to improve it.


The screen isn't sitting level in the housing because its not bolted together.


I found that grounding the signal wire to the car chassis made the rpm float around 5,000 rpm. So I fired up the ol' Buick next to the car for some not matching video sound

https://www.youtube.com/watch?v=WuaOh3s5ECA


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"How I learned to stop worrying and love the OHC Pontiac L6"



The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)

1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
  #430  
Old 06-01-2024, 11:41 PM
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Just poking away at it still.

I mounted the electric water pump. I had it mounted to the battery tray, but I removed the tray so I made another mount for it and set it on some bolt isolators to keep the vibration from humming on the fender well.

I enlarged one existing hole and used another as is.




From the bottom.


This is just a hose I had on hand. I may replace it with one that is a few inches shorter.



I also mounted the remote oil filter and made the high pressure lines. I'm sure I'll get grief for mounting the filter open side down, but it made the most sense for access and limited the length of the oil lines. The filter does have an anti-drain back valve and I'm going to augment that with the EFI not lighting off until it see's oil pressure. I've read that when removing the filter, punch a hole in the top of the filter and wait a bit and most the oil will drain out of the filter before removing it. I can soak most the filter media and have some oil in the filter before install. The reasoning I did this is the factory oil pressure port is pressure BEFORE the filter, so tapping it for the lash adjuster galley and turbo feed meant that it was unfiltered oil going to them. Also this gets by the convoluted internal passages from the accessory drive to the block. I'm going to use the adapter's inlet as an outlet source of oil for the lash adjusters and turbo. It will be backfilled from the block feed and be filtered.

I'm probably going to install a 90 fitting for the oil pressure sensor to keep the wiring along the core support.




Where I left off for the day.



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"How I learned to stop worrying and love the OHC Pontiac L6"



The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)

1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
  #431  
Old 06-10-2024, 01:12 PM
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TheSilverBuick TheSilverBuick is offline
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Starting to look more like my engine with the coils mounted! Poking away on it.



About done with the cooling system. Just have to add hose clamps and cap a port on the water pump. I welded together a Y-fitting to merge the two water pump outlets into one. Painted it black and put a heater hose over it to hide my welding sins, LOL! Also tied the heater hoses to the heater box and fender well to keep them off the exhaust. At least one of the hoses always sat against the turbo exhaust and survived, but I didn't like it. That header wrap really works, plus it was just putting more heat into the cooling system.


Made a new turbo drain line to drain to the oil fill tube. I previously had it draining to the fuel pump block off plate, but I had to clearance the intake tube to make it fit. The new line doesn't interfer with anything and drains to the back of the engine so quicker return to the sump.


I still need to mount the lash adjuster oil pressure regulator and run the lash adjuster oil lines as well as turbo feed. I think I'm going to mount the regulator off the lower stud holding the turbo to the head. Keeping it down low.



I still need to install the transmission, likely mount an external transmission cooler, run the exhaust cross under pipes (possibly making new ones), install exhaust pressure sensor tubes, then lots and lots of wiring.

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"How I learned to stop worrying and love the OHC Pontiac L6"



The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)

1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
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