LOL, I did say Bonneville and WOT for 5 miles ish.... The is a lot of not WOT, but he knows the intent
Do Roller Cams in Big Blocks Need Oil Restrictors for the Lifters?
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TT5.9mag
Two atmospheres are better than one
Good. But that doesn’t give him the rpm range. Could be geared for 6500 or 9000. As long as he knows the rpm sustained he’ll be able to dial in the spring load.
I told him 7000-7500 for 5 miles. Not that the rotating assembly can do that as it is. Or it will. Or a Yard Sale. Or....
TT5.9mag
Two atmospheres are better than one
We should start a poll, maybe in another thread but it would be good knowledge. How many people would be willing to hold an engine they assembled at max rpm and max load for 3,4,5 minutes straight? When my boat engine was on the dyno I asked Brule to hold it at 5800 rpm (impeller full load speed in the boat) for 2 minutes. I said if it breaks I want it to happen here. Both of our *** holes were puckered up on that run. At 5800 rpm with ~85% load it was making 750lb/ft for 2 minutes.
Tom Nelson built a twin turbo LS for a race boat in Australia (I think) and he held it at 7000 rpm on his dyno for 5 minutes straight at full load. That’s a great video. The specific output of this engine is wild.
Tom Nelson built a twin turbo LS for a race boat in Australia (I think) and he held it at 7000 rpm on his dyno for 5 minutes straight at full load. That’s a great video. The specific output of this engine is wild.
TT5.9mag
Two atmospheres are better than one
I don’t worry about the bottom end at all at 7500. If the valvetrain is right the bottom end will be fine.
So, not my engine, but I have run engines at WOT ~6400 for 3-500 HOURS. Stopping every 12hr for oil check, leaks, etc. Oil change every 100hrs. So.....
TT5.9mag
Two atmospheres are better than one
Yea the load testing done on a manufacturers level is insane. How many guys would be willing to that with their 400hp small block they put together in their mom’s basement?
It is something else to fire it up, warm up, run to WOT and leave it there until you go home 12hrs later. Rinse and repeat all night.... for weeks. Yes 20 Days of WOT
Also, figure in some cases, that is 40-50 gallons of fuel per hour. Let that marinate a minute
TT5.9mag
Two atmospheres are better than one
Well at 500 hours that would be about 20,000 gallons of fuel. Unreal.
Now, when there are 10 of those running like that......
TT5.9mag
Two atmospheres are better than one
No one said testing was cheap. And guys complain about $1000 dyno session. SMH
And don't forget that these durability dynos do not use "run of the mill" gas station fuel. They run specific certified ($$$) fuel as you cannot afford a failure due to a bad batch of fuel.
And as stated above, if you assume a bsfc of 0.45 (in English units), and the engine makes oh, say 600 hp, you can see you're in that 50 gal/hrs range. HP goes up, fuel consumed goes up.
Lets not forget the thermal cycling tests too...start the engine dead cold, immediately go to WOT and hold at peak power, wait for the coolant to get near boilover, shut off and immediately run cold water through it until the engine is stone cold again. Now repeat for thousands of times. Or how about piston scuff tests or .... I'll stop there.
As much as I (and a bunch of we on this forum) love these old engines, the testing done on today's engines would destroy these old engines in short order.
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Can I ask where you work doing such testing? A friend of mine got a contract to dyno test remanufactured parts for Subaru engines and I witnessed some of the wide open throttle max rpm tests. I have had three of my engines dynoed, but that was eye opening.
Been part of those. Chilled room, light it, straight to WOT, wait for temps to come up. Shut it off. Wait until til next day. Light it, straight to WOT. 35⁰ air and water temps at start.
Worst was 20hrs on the rev limiter 6600.
Jeremiah (jd)
Well-Known Member
You want 9310 rollers. 8620 is for lifter bodies. 9310 is HARD..like only cutting it with carbide hard. As said above DLC coated, bushed 9310 rollers are top of the line. I'd also put a call in to jesel.
The Isky Redzone bushed roller lifters with the EZ max option are rated to 1400lbs of spring pressure.
The Isky Redzone bushed roller lifters with the EZ max option are rated to 1400lbs of spring pressure.
Jeremiah (jd)
Well-Known Member
Also, spring pressure is not dictated soley on RPM. It is dictated by cam profile and component weight.
For what you are doing Ti valves and paired rockers should be in the plan. It's important yo considwr valvespring mass also. Those big 1.640 tripple springs have diminished retirns in an endurance engine. I'd be looking hard at DLC or PVD coated TI valves with Manley Tensilemax retainers. Manley makes a trick DLC coated bead lock style lash cap that is captured by the valve lock (Loc cap IIRC,).
For what you are doing Ti valves and paired rockers should be in the plan. It's important yo considwr valvespring mass also. Those big 1.640 tripple springs have diminished retirns in an endurance engine. I'd be looking hard at DLC or PVD coated TI valves with Manley Tensilemax retainers. Manley makes a trick DLC coated bead lock style lash cap that is captured by the valve lock (Loc cap IIRC,).
All the OEMs have their own "proprietary" specific tests. How many hours, how many cycles, what the rpm and load profile looks like, etc, etc. And of course there are the low speed tests where you want to limit splash oiling. Gotta pass those "granny" tests too.
Sounds like you've seen lots of these tests too!! Pretty brutal stuff but it's part of what it takes to put/keep modern engines in production.
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Some are boring, some are exciting, and some are just painful to watch, run or hear
Jeremiah (jd)
Well-Known Member
Food for thought:
Manley Tensile max (22g), Tensile max lightweight (19g), Manley Ti (18g) and the Ti valve lock specially made to accept the LocCap (9310 I think).
Manley Tensile max (22g), Tensile max lightweight (19g), Manley Ti (18g) and the Ti valve lock specially made to accept the LocCap (9310 I think).
TT5.9mag
Two atmospheres are better than one
That’s some high dollar **** there. Although very nice, I’m not sure the first attempt with the car will need to be that serious.
Jeremiah (jd)
Well-Known Member
It's not that high dollar. All of my engines use that stuff it's a few hundred dollars additional cost compared to tool steel. Do it once beat on it for years that's my motto. I'll eat PB&J for lunch and have peace of mind at 8500 : D
TT5.9mag
Two atmospheres are better than one
Jeremiah (jd)
Well-Known Member
lol I like how you think. Wanna sponsor us?
All you have to do is ask
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