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The Twin Screw Thread

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Old 05-15-2018, 01:32 PM
  #3001  
hans14914
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I released the purchase order for the tensioner brackets yesterday. I had been holding them, which ended up being a good idea, as I needed to make a last minute change to improve the front harness routing. There is now a machined channel behind the tensioner bracket that holds the front harness and the two spark plug wires that cross over to the driver side distributor cap. The other two wires will route above the waterpump and below the new thermostat housing.

Mock up plastic pictures attached. Thermostat housing fits with just enough room to spare, but does not rub on the timing belt cover and the factory hose is used with just the last 50mm removed. Note that there is actually a bit more room that shown between the belt and the hose, I will get a better picture tonight mounted on a car with a radiator installed. Also the photo shows the tensioner in the fully extended position, so this is the closest the belt will get to itself in this current routing. The actual belt used will be shorter, but the plastic parts are not strong enough to hold up to tension.

Thermostat housing is out for bids today. The fitting is over the counter from an electric waterpump.

The new regulators came in, and I tested the first one last night. I have a good mounting solution for it using the fasteners for the factory coolant expansion tank. I need to look at the second regulator tonight to see if it will fit on the back of the throttle inlet, but I am leaning towards the remote mounting in that rear passenger corner.

I should be able to release the throttle inlet housing for bids tomorrow after finalizing the regulator location selection.



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Old 05-16-2018, 09:53 AM
  #3002  
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That is good news. I may fly my plane down to SITM for the day to see parts.
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Old 05-16-2018, 11:24 AM
  #3003  
hans14914
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Hoping my machine shop can return the tensioner parts before, but its getting tight. The wait paid off though, incorporating the engine harness passthrough was a large improvement. Wouldn't have caught it until I installed the test bracket on my 89 that has been out in the sun for a decade and the harness is old, hard, and stubborn - It did not like the idea of being relocated.

Throttle inlet will be out for bid this week. Next part up on the agenda is the front-mount heat exchanger. I need to look at non-destructive flap component removal procedures to get the size core I would like in there. My 89 has volunteered for the job. Its an auto too, so the "worse case scenario" for designing the core/bracket/lines. If I can get the core large enough, I wont need to have the holding tank fabricated for under the passenger headlight.
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Old 05-16-2018, 11:57 AM
  #3004  
davek9
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Hans getting that belt system sorted out is a time consuming task for sure, yours looks great!

It's funny I'm currently working on redoing the old Andy Keel kit's, moving the tensioner pulley to the "slack" side and making the adjuster a "puller" like the Alt and AC compressor and not a pusher bolt.
Without making a completely new bracket, as the dip stick gets in the way to push the pulley from the cars right side.



I also feel like I own a BOAT, because I just busted out another thou, 044 FP, S4 Reg, Super MAF, Provent.. it doesn't stop

Dave
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Old 05-17-2018, 03:30 AM
  #3005  
soontobered84
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Originally Posted by hans14914 View Post
Hoping my machine shop can return the tensioner parts before, but its getting tight. The wait paid off though, incorporating the engine harness passthrough was a large improvement. Wouldn't have caught it until I installed the test bracket on my 89 that has been out in the sun for a decade and the harness is old, hard, and stubborn - It did not like the idea of being relocated.
I know a guy in Denton, Texas that makes a helluva new year model specific 928 Engine harness using all new connectors and 21st century materials. The sub-harnesses are oriented correctly where they break away from the main harness, the wire colors are correct and the harness is plug and play.
Oh, that's right. You know him, too.
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Old 05-19-2018, 06:53 PM
  #3006  
BrianG
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Dave, i have an old Andy Keel system as well. I'd be interested to see how you got that belt past the thermostat housing and how you converted to a puller tensioner.
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Old 05-20-2018, 01:25 PM
  #3007  
davek9
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I've been working on a few things at once, I removed the basic Oil Air separator (an aluminum can w/vent and drain) and installed a Provent with a new filter where it fits nicely between the custom shroud&Fans.
As for the Pulley move, mine also was tight, so tight the SC belt just touched the AC pulley and took of a mm before it would settle in. In speaking with Darin N. it seems all the kits varied a bit.
So I can only lay out the basic method I used to achieve the goal of making it a pull type tensioner and not the push bolt.

I used a "U" pre-bent bracket I had in my scrap box, a slightly thinner bolt 8mm shank and not the 10mm so I would not have to drill out the threads in the bracket (i didn't know if it would work).
Then I notched the "U' bracket so that it sits flush to the back of the Tensioner bolt mount and drilled a hole for the bolt, I also used a steel sleeve over the end so that the new adjuster nut would not hit the bracket.
It worked great and I'm going to improve it and keep it this way.
Here are some pics

Provent



Pulley-Move






Dave.
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Old 05-20-2018, 04:07 PM
  #3008  
Tony
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^^^^^ looks good.


FWIW..i got an extra water neck and cut the bend out and welded it to the end of the stock piece. It gave me just the room to run the belt down with out interfering with the rad hose.
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