Jump to content
  • When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Ignorant q: no cam-bearings?!?


Guest Anonymous

Recommended Posts

Guest Anonymous

I just found out the engine I have has no cam bearings. Just

the steel camshaft in the alloy head. Weird. All other engine-

types I've worked on did. Is it worth fitting bearings? Has

anyone done so?

Thanks,

Hugo

Link to comment
Share on other sites

Guest Anonymous

Cam riding in plain bores is just fine !

No cam bearings, the head casting is align-bored and oil is fed to the journals.

I use an oil restrictor in the gallery which feeds up from the front of the engine block to supply the head.

The size reduction from my restrictor is like going from ~10 mm to 2.5mm (approximate numbers, don't quote me). This limits a lot of the oiling to the head, which prevents oil pooling up there due to the constant high RPM usage it gets.

The point to the above description is that even with the restriction in oil to the head, I found the cam journal bores in the head with no wear after 15 years of hard use. The head had originally been align-bored for a larger journal cam, and the machine marks were still evident on head's enlarged cam journals. That helped validate the use of the restrictor (which was designed to improve oiling on the lower end.)

If you do find wear on a particular spot on the journal bore, or have any indication there is binding with a known "good" cam, I'd suspect the head was warped. OR was warped, then machined flat on the bottom, which stll leaves the cam bores mis-aligned.

Link to comment
Share on other sites

Guest Anonymous

The only real bearing you could put in there is a needle roller bearing for like more HP.. but there's no need for a cam bearing... alot of DOHC heads don't run a cam bearing.. honestly it's not uncommon... v8 pushrod engines run them because they're usually a cast iron block..

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • BMW Neue Klasse - a birth of a Sports Sedan

    BMW Neue Klasse - a birth of a Sports Sedan

    Unveiling of the Neue Klasse Unveiled in 1961, BMW 1500 sedan was a revolutionary concept at the outset of the '60s. No tail fins or chrome fountains. Instead, what you got was understated and elegant, in a modern sense, exciting to drive as nearly any sports car, and yet still comfortable for four.   The elegant little sedan was an instant sensation. In the 1500, BMW not only found the long-term solution to its dire business straits but, more importantly, created an entirely new
    History of the BMW 2002 and the 02 Series

    History of the BMW 2002 and the 02 Series

    In 1966, BMW was practically unknown in the US unless you were a touring motorcycle enthusiast or had seen an Isetta given away on a quiz show.  BMW’s sales in the US that year were just 1253 cars.  Then BMW 1600-2 came to America’s shores, tripling US sales to 4564 the following year, boosted by favorable articles in the Buff Books. Car and Driver called it “the best $2500 sedan anywhere.”  Road & Track’s road test was equally enthusiastic.  Then, BMW took a cue from American manufacturers,
    The BMW 2002 Production Run

    The BMW 2002 Production Run

    BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated:  small, boxy, rear-wheel drive, two-door sedan.  Aficionados know better.   Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run.   I’ve extracted t
  • Upcoming Events

  • Supporting Vendors

×
×
  • Create New...