Force, when you say you are using the H-series, are you running the HK, or just the regular H? Apparently there is a misconception as to which ones actually have the graphite coating on them. They have to have the "K" suffix on the part number to be coated. FWIW, my engine builder replied and said that he always runs the regular H-series bearings and has never had an issue with them.

H Series - Best to start with when unsure which bearing to choose

Medium level of eccentricity and high crush
Enlarged chamfers for greater crankshaft fillet clearance
Made without flash plating for better seating
Use with crankshafts that have oversized fillets
Use with engines that run mid-high RPM range
Contact patterns should ideally cover 2/3 to 3/4 of the bearing surface

P Series
Typically the greatest level of eccentricity
Rods and mains have high crush for maximum retention
Most are fully grooved to maximize oil flow to rod bearings
Reduced overlay thickness to prevent overlay fatigue
Use where extremely high RPMs cause severe rod bore close-in
Use where higher eccentricity is desired to narrow bearing contact patterns

V Series - This series essentially duplicates Clevite's former Vandervell parts
Typically low to medium eccentricity
Not available with oversized chamfers
No flash plating on the steel back
All Clevite main bearing sets use a single-piece thrust bearing
Narrowed parts available to accommodate increased crankshaft fillet clearance
Lead-indium overlay offers slightly better conformability


--------------------------------------------------------------------------------

Part Number Key
H - High-Performance
HD - High-Performance bearing with dowel hole
HK - High-Performance bearing with moly/graphite coating
P - Standard Clevite 77 tri-metal bearing
N - High-Performance Narrowed for greater crankshaft fillet clearance
HG - High-Performance full angular grooved bearing
V - High-Performance with Lead Indium overlay (On Main Sets this indicates partial groove also)
VG - High-Performance with Lead Indium full angular grooved bearing
D - Bearing has a dowel hole
K - Tri-Armor coated bearing
X - Bearing has .001 more oil clearance than standard
XX - Bearing has .002 more oil clearance than standard
A or AL - Indicates Aluminum bearing material

fixx
 

Excuse me?? i dont make it a habbit of calling myself a pro engine builder............sorry i mistook the letter in question and yes i use the hd bearing in the race engines with the alunimum rods...ALL the pro engine builders i know wont use a h style bearing on a cast crank PERIOD...
Its guys like you that hide behind their keyboard making smart azz comments to pizz off people like me....

ok back to the trand and sorry for the cork screw..

I think you mean HD...

fixx
 

yes ! correct hd bearings.. i corrected it thanx..

Didnt mean to pizz you off, but fact is the H series bearing can be used with cast cranks, I have yet to see or have anyone explain to me why not? and also fact is in my own engines I have cast cranks and coated H series bearings, 5 years... no issues and 80 lbs of oil pressure, I am no professional builder myself, but I have built many engines over the last 25 years and I am not a newbie to it...

I would have to find paperwork for part numbers, I know they are coated H-series, in the early days my macinist had to send them out to be coated, that was before Clevite offered em coated..regular are silver in color looking, coated are very dark grey looking... easy to tell difference.

I am a firm believer since I have had water contamination and they saved me, that extra coating helps when things go bad...regular is also fine, but I have the preferance of coated since thay have saved me a crank...

If you order a rotating assembly from just about anywhere, if you get a cast crank, you don't get H series bearings. Forged cranks, you do. Cast come with P series, standard King, etc. Forged come with H series, King Alecular race bearings etc.

http://www.flatlanderracing.com/scatsr-chevybbcast.html

http://www.rpmmachine.com/scat-strok...0hp-2pcrs.html

John Lingenfelters thoughts on this....

http://books.google.com/books?id=GUC...kshaft&f=false

Not a mention of cast vs. forged...

http://www.google.com/url?sa=t&rct=j...WhrFBRO-ZtPAmQ

Not tryin to debate ya. I personally have never ran cast cranks, so I cant say. I do recall in one of my clevite books it mentioned something about using the H series on a cast crank...Ill have to look.

Maybe one of the pro builders can shed some light...