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  #61  
Old 1 Week Ago
RootesRacer RootesRacer is offline
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I wonder if your wide NOS towers are for an iron head engine?
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  #62  
Old 1 Week Ago
Jay Laifman Jay Laifman is offline
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I have no idea.

I got the shorter pushrods. It looks like they will make it all work. One bummer is that they are 1/2 ounce heavier than my current pushrods (shorter ones: 3.25 oz; longer, hollow ones: 2.75 oz). I don't know how much of a difference that makes. For my purposes, probably realistically nothing.

I will still remeasure the ratio and check how the roller path aligns on top of the valve.

I also need to confirm that at full open, when there is the greatest angle of the top of the pushrod to the bottom of the rocker, that there is no contact. It looks like it will be fine. But I will of course check for sure.
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  #63  
Old 1 Week Ago
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alpine_64 alpine_64 is offline
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Jay are you running isky push rods?
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  #64  
Old 1 Week Ago
Jay Laifman Jay Laifman is offline
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I have no idea! I think the guy who built my engine 20 years ago must have selected them and determined the right size.

Is there a reason it's relevant?
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Last edited by Jay Laifman : 1 Week Ago at 01:13 AM.
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  #65  
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alpine_64 alpine_64 is offline
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Quote:
Originally Posted by Jay Laifman View Post
I have no idea! I think the guy who built my engine 20 years ago must have selected them and determined the right size.

Is there a reason it's relevant?
I just remember that isky used to do hollow cromoly pushrods but they were different to stock. Iirc jarrid had mentioned they wwre slightly different size and also weaker than stock ( this was around 2003.... So might be best if jarrid chimes in)
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  #66  
Old 1 Week Ago
Jay Laifman Jay Laifman is offline
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Here are pictures of the shorter stock pushrod from Sunbeam Specialties next to the lighter but longer ones I had in my car.



Attached Images
File Type: jpg Alpine Pushrod tips.jpg (49.6 KB, 69 views)
File Type: jpg Alpine Pushrods.jpg (25.4 KB, 72 views)
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  #67  
Old 1 Week Ago
RootesRacer RootesRacer is offline
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Quote:
Originally Posted by alpine_64 View Post
I just remember that isky used to do hollow cromoly pushrods but they were different to stock. Iirc jarrid had mentioned they wwre slightly different size and also weaker than stock ( this was around 2003.... So might be best if jarrid chimes in)
I had never had any experience with the Isky parts till Chris Albers engine builder (Taylor engines in Whittier CA IIRC) used them and Chris called me over after his startup that the engine was running weird.

I suspected valve adjustment and when he pulled the valve cover off, it was clear he had a bent pushrod.
Not sure of the "how" on the bend but considering it was just low RPM break in, the strength of the pushrods came into question.

I dont recall if he got a single replacement from Isky or if he got an NOS set.
The engine went on as normal after whatever replacement he came up with.

I will also mention that I bought some sunbeam isky lifters thinking they would somehow be magic and they turned out to have thicker walls and were substantially heavier than stock ones. From what I recall, those that used isky lifters in racing sunbeams would drill lots of holes through the walls to lighten them. I ended up not using them.
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  #68  
Old 1 Week Ago
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DanR DanR is offline
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Quote:
Originally Posted by Jay Laifman View Post
Here are pictures of the shorter stock pushrod from Sunbeam Specialties next to the lighter but longer ones I had in my car.

Jay, The push rod on the left in 2nd PIC's is like my SV 1725 ones....

DanR
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  #69  
Old 5 Days Ago
Jay Laifman Jay Laifman is offline
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Quote:
Originally Posted by Jay Laifman View Post
I have measured the ratio.

I got .306" for my cam lift. I have a Holbay H120 cam. I hope that matches some Holbay cam.

For the stock rockers I got .442" of movement measured on the spring retainer.

For the roller rockers, I got .456" of movement.

.442/.306 = 1.444

.456/.306 = 1.490

I had ordered "stock." So I would have expected closer to 1.4:1. If my measurements are correct, I got closer to 1.5:1. The big question now is if I have clearance for that extra .014".
The rockers and shorter pushrods are all in and gaps adjusted. With that, I'm getting .431" movement of the valve at the spring retainer.

.431"/.306" = 1.408

Looks like they are dead on the 1.4 stated factory ratio.

I won't be able to run it until probably late Saturday due to commitments. But all I have to do is put the side plate back on and change the oil.
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1965 Sunbeam Tiger
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  #70  
Old 16 Hours Ago
Jay Laifman Jay Laifman is offline
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Installed and running nicely. Sadly, the one thing I was hoping to fix was valve train tapping noise - and the tapping is now louder! Is that a characteristic of roller rockers?

I'm going to run the engine with the valve cover off and see how much oil comes out of the holes on the rockers. I've seen various comments on this board about the oil just weeping out of the stock holes, to some people saying that it sprays around. Is there a "correct" version? I know that mine basically weeped at idle before. I'm wondering if I'm not getting enough oil to the rockers - though they certainly don't look like it, and if I don't have a good valve cover gasket, I definitely get oil leakage!
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1965 Sunbeam Tiger
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