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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #21  
Old 2 Weeks Ago
Piemonte Piemonte is offline
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I have taken some crude measurements of temperature, before and after the oil cooler installation, with a simple IR thermometer gun. Obviously I couldn’t control all variables, so take it with a grain of salt. I checked temp at various locations on the engine (both barrels, both heads, oil tank, cases) as soon as I shut off the engine. Once I clear the suburbs my ride home is very consistent, no traffic lights or intersections for the final 16km (10 miles), so the engine is predictably doing the same work to get me home. Obviously the ambient temperature was out of my control but I know the daytime temps were very even. I didn’t conduct this scientifically, nor record individual measurements, just a quick ‘average it out’ score over several rides in the space of a week or so. The result? Temps were lower, by around 20 degrees Fahrenheit.

I know oil cooler discussions are almost as hotly (do you like the pun ��) contested as ‘best oil’ and ‘best tyre’ posts, I just like it for the confidence when I’m riding in hot weather. Plus it adds a little extra capacity (200ml?), and I know it lowers the temp, whether that’s a good thing or a non thing. Granted, if I rode in cold weather I would either remove it, or more likely throw a cover over it.
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Isn't that why we and HD used to recommend 50-60 wt oil? I used Valvoline 60 wt racing oil. It had plenty of slick additives kind of like the old STP built right into the product. We were never using automotive grade and weight oils. Chevron used to sell a bulk 50 wt, I believe it was for farm equipment. The one guy who used 30 wt was a master mechanic.
D
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  #23  
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I think you’re bang on the money here. I have to question my own usage of multi-grade oils...when/why did we switch? Old school HD knowledge in Australia says 50w year-round, go 60w if you live somewhere hot, and use straight 30w for cooler weather riding. The multi grades are an approximation and perhaps not suited to the IH.
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  #24  
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Quote:
Originally Posted by 11B40 View Post
Piemonte: "I disconnected the rear chain oiler but left it in situ, capping off the supply point."


Consider you target reader: We will accept "Where it was" but Latin??? These are Harley people...
D
Point taken. Though I bet there’s a few on this forum that had Latin inflicted upon them way back in the dark days of their school education.
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Quote:
Originally Posted by Ferrous Head View Post
So, you put the oil cooler on to make the trip to Lake Gairdner in March ?

(They tell me it gets hot there)
Lake Gairdner remains firmly on my bucket list. However, weather, border closures, and directives from the chief financial officer, may conspire to curb my enthusiasm. I will get there one day, hopefully as an entrant. They say Salt Lake Racing is like sex; it is better to be a participant than a spectator.
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Quote:
Originally Posted by Ferrous Head View Post
Piemonte.

"Harry's Cafe De Wheels "?

Did you mean for your thread "HD Racing Downubder" to be in the Ironhead section ?
No, I needed a username for forum registration, looked for inspiration, and chose something topical in my life. We’ve just had the 10th anniversary of the passing of my beloved dad. He was from a hilltop village in Piemonte, NW Italy. So it’s in honour of my dad’s birthplace.
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  #27  
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Good name then.

Not sure how I connected Piemonte with Harry but in my dim dark memory it struck a cord.

Planning to go to the Lake this year (hope), depending on lockdowns, money, time and assorted other problems. Not to spectate - to far just for that. Going to run my sidecar there, I hope.
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There are a couple of givens when dealing with Bonneville. I did 10 straight years and know a bit about it.
First: Never.....repeat NEVER take anything that you value out onto that salt. It is impossible to completely remove all of the salt. If it rained out there (which happens all the time) and you drove through several inches of salt water, it really wrecks your vehicles. You will be replacing a starter every couple of years, even the tools that work on your van will be rusted. I watched a nice one ton 1969 Ford Supervan, low mileage, completely ruined in a couple of years.

Two: Getting that "Participant" sticker and hopefully Long Course sticker will be the keys to the kingdom. You can see everything you need to see in one day as a spectator. You can participate for a week and not be satisfied. But you will have a chance to talk to famous knowledgeable people who don't mind spending the time to help you.
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Quote:
Originally Posted by Ferrous Head View Post
I have no idea what the PSI on the return side of a 900 style pump
There is no pressure relief valve on the return circuit, so the pressure will rise until it blows a hose or shears the pump gear drive.
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Quote:
Originally Posted by kitabel View Post
IME if you can keep your hand on the tank for 5 seconds it's cooler than 160 degrees = no cooler needed.

Read the race car books: cooler must be bled or burped.

Apple / Oranges

It is impossible to burp an ironhead cooler, because HALF of the pumped volume is air.

Many race cars have the oil cooler in the pressure side not the return side so it's not even in the same zip code as an Ironhead.
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