TSP Level 2A-R Prototype Specs and testing (Larry's motor)

Great post larry , thanks to you i am in the process of collecting parts to build a similar engine to yours . I was just going to do a roller cam in my 464 but you have motivated me to do a new short block .. Sweet :3gears:

 

I'd like to solid rollers swapped for your hydraulic rollers. Just curious to see if the Power would change.

 

I had a long conversation with Mike T a few years ago regarding hydraulic rollers and the possibility of an agressive lobe causing the lifter cup to plunge (loss of duration) before the roller can climb the lobe. If this is true, what lobe profile or aggressiveness causes this? Installing solid rollers on your current roller cam could show if the possibility truly exists. You may find more power. If you don't, TA may increase consumer confidence in budget rollers. Just a thought.

 

Don't think this is a problem Rob, although this was my concern with the hyd roller stuff when we began.

If we had that issue, power would be weaker than the flat tappet cam of the same profile, or maybe the same, and we would have a serious problem with rpm ability.

We have neither thing going on here.. good power increase going to the roller, and I have had a couple on the dyno now, they hang on till around 6000 rpm, which is all you can really ask from a hyd roller. Both motors have reached their peak before rpm issues set in.

I think all we would find with solid roller lifters is noise, and a loss of power, due to the lash required. At least that's my guess.. I have a set of solid roller lifters, and if I ever run into one that really poops out early, I will put them in the motor and see what happens.

JW

 

Jim, I understand what you're saying just wondering what the change would show, we could see a gain near the top of the rpm range. Up to you guys, just food for thought.

Happy Easter everyone!

 

The unknown I'd be concerned about by putting solid rollers on the hyd roller cam is the lack of lash "take up ramping" the hydraulic profile offers and whether or not that would be a durability issue for the roller end of the lifters (needle bearings, axle, etc.).

Devon

 

Re: Summary rehash of design goals for this engine? (Re: Larry's motor)

What he really meant to say is he was tired of being slower than me :bla:


Now he's gonna kick my :moonu:

:ball: :ball:


Jim - anyone ever cally you Scotty before ?

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Alan --you have to give it to Larry. He was gracious enough to agree to send his new roller mill down here for us to test, tune and break it in for him. Not many would have agreed to do that. p

 

Devon, that is a good point, the clearance ramps can be different between the two lifter styles but imo the duration is mild and I think it's worth a look. Other have swapped solids on to 413 cams and found power. We know what the power loss looks like with the 413 but what if this is only partial loss in comparison. Either way, as Jim pointed out, it is very kind of Larry to allow some development work on his engine. I don't think solids on his roller cam is a long term solution but the thought of it (obviously) intrigues me. Once a development engineer, always a development engineer.

 

Thanks very much! (Re: Design goals for Larry's motor)

Thanks Larry! :TU:

Your retrospective description went a lot way to put the whole build into context.

Speed isn't my thing, but there is still a lot to for me to learn out of your build experience. I was really glad to see the sort of gas mileage your were getting. The more I hear about the roller cam the more this seems like a really good choice the get the most out of the engine.

Can I ask one more question? I see you are going with chrome valve covers. I had heard that chrome valve covers have problems getting a tight seal and aluminum was more prudent. Have I been misinformed?

Thanks for sharing!

Cheers, Edouard :beer

 

Interesting thread!!

Jim or Larry

I've got a solid roller in my BB 433 Corvette and the real concern when I bought it seemed to be the longivity of the roller lifters. What brand are you using in this build.o No:

I've put about 5000 miles on mine on the street and so far so good.

Just wondering????

Thanks

 

Hyd Roller lifters are made by Morel.

While that might not be a name that sounds familar to you, they are the actual suppliers for most cam companies top quality hyd roller lifters.

JW

 

Morel solid roller lifters are what we used on my engine and my cam supplier said they were the best for my application. :TU: I've had no problems with them after about 8-10 K miles.

Just checking to see if anyone has come up with something better.

Larry, sounds like your build is Top Shelf!!

:beers2:

 

Like chrome valve covers too! (Re: Design goals for Larry's motor)

Dear V-8 Buick members,

Thanks Larry for answering my question on valve covers.

I had resigned myself to the aluminum valve covers, so your comments are music to my ears. If indeed Jim can repeat the same magic that he has worked on your engine, I'll follow your lead with chrome. As you point out, it makes the engine look more: "modest, unpretentious and unassuming - the paradigm of humility!" :grin:

Happy Easter everybody!

Cheers, Edouard :beer