Shoptalkforums.com

nsracing wrote: Some people actually think they are the only ones who can use Bridgeport milling machines.

Good luck.

The thing that makes me wary is Jake has spent a ~year developing his roller lifter program, and is only now getting to the point where he feels the reliability is sufficient for his purposes. A lot of his issues were bushing material...

Admittedly, Jake is a perfectionist, but it makes me very wary of having some local shop slam in a set of keyed rollers.

I have a Bridgeport, and I sure as heck am not trying it myself.

Just because you had brought a Bridgeport home does NOT necessarily mean you become an expert machinist overnite.

It takes training and the due diligence to do stuff on any machine. But then again I have seen very talented home machinists with no formal schooling do some seriously tough projects. But these people are well-read that is for sure. Some people just have the innate gifts to do stuff. So I will not discount them.

But my point is that a local machine shop ought to be able to do the job competently if they are worth their salt.

wow nsr, is that a snotty reply, or am I taking it wrong.



Rob

NO snotty there. Just saying the facts.

There was once a fella here that told me he can never machine the tolerance needed for lifter bore clearance using a Bridgeport. And he also said he had been machining for years. Sure whatever.

I said.. you mean to tell me that you cannot come to within 5/10,000 inch of clearance on the bushing using a boring head??? That to me is ignorance of the tools he already had. What the heck...the dial reads 1/1000 inch. So what was so hard?

I just shake my head when I see this.

cool, /i guess I have not had enough coffee yet.

This is a subject that is near and dear to me, and I have never understood what the big problems are with running the roller lifters in our aircooleds.

Especially when you realize that with the fitment issues that are necessary for running the roller lifters, another step or two, and you can run roller hydraulic lifters. Then we are making more progress to get our old aircooleds into the modern age.

You do not have to go roller at all. The flat tappet design is still good.

For the wasser case, the Type I lifter are very much a viable option. It is just a matter of re-sleeving the lifter bore areas. The Wasser has a lot of room for pretty much any configuration you desire. Just a matter of machining it.

I collect wasser cases myself. It is my choice of case now for high performance drag engines. Even working on some cranks now for ultra-performance applications. I have not offered it for general consumption, but I hope to later on per exchange basis.

I didn't take it as being snotty, FWIW, I just know my limitations, and the limitations of most of the machine shops within 200 miles of here.

They seldom can follow simple directions the first time, much less do anything they haven't done a thousand times before.

With T1 mushrooms becoming available in tool steel soon, I'm somewhat dubious of the advantages of rollers on the street, esp concerning reliability. nice and light, too.

Most available street cam profiles/ramps do not take advantage of a ~1"+ dia lifter face, even the ones supposedly developed for them.

The hydro rollers may have the same issues with air in an ACVW as the stock hydros...
They can drain out/suck a little air laying on their sides, it's an unnatural position for them.
Probably only annoying.

Piledriver wrote: With T1 mushrooms becoming available in tool steel soon, I'm somewhat dubious of the advantages of rollers on the street, esp concerning reliability. nice and light, too.

My VN119 has about the same duration @ 0.050" as an Engle K8, and 12 degrees more duration at 0.300".

Very very streetable, pulls clear to the rev-limiter at 7K and would probably keep going.

As far as reliability goes, I've been driving the car daily (and driving the piss out of it) since November. Has it turned 30K, 60K, 90K miles? No, not yet...and maybe it never will, but I don't really care. The desire to "make it last" was quickly surpassed by the reality of "blazing a new trail", which means 'complete and total failure' is a possibility, and I accept that.

Piledriver wrote: The hydro rollers may have the same issues with air in an ACVW as the stock hydros...
They can drain out/suck a little air laying on their sides, it's an unnatural position for them.
Probably only annoying.

I was thinking of the crossbar type, to keep the vent in the correct orientation

Rob

helowrench wrote:

Piledriver wrote: The hydro rollers may have the same issues with air in an ACVW as the stock hydros...
They can drain out/suck a little air laying on their sides, it's an unnatural position for them.
Probably only annoying.

I was thinking of the crossbar type, to keep the vent in the correct orientation

Rob

Yeah, on rollers, thet are always pinned/keyed in some fashion, so all you would have to do is make sure the lifter body oil passage points up if you ever plan on running hydraulic rollers.

OTOH, there is a likelyhood the "air in the lifters" is just a collection of bubbles from foamy oil.

The pressure relief return to the pickup almost surely makes that worse, as done on the WBX and hydro T4 cases... as tencentlife pointed out.