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by engineguyBill
Fri Oct 23, 2020 10:56 pm
Forum: Engine Tech
Topic: Recommendation for Machine Shop / Engine Builder in CA?
Replies: 15
Views: 453

Re: Recommendation for Machine Shop / Engine Builder in CA?

Mike Lewis is a very qualified engine builder. However, if you are in Southern California, check out Jeff Ginter Racing Engines in Artesia. Phone 562.972.9763. Jeff has been in the high performance industry for several years.
by engineguyBill
Sun Oct 18, 2020 11:05 pm
Forum: Engine Tech
Topic: Top piston ring gap - whats really required?
Replies: 34
Views: 1697

Re: Top piston ring gap - whats really required?

Combustion heat is transferred through the piston top to the piston ring, then through the ring to the cylinder wall, to the coolant jacket. Real-world testing has shown that ring gap is not critical in developing torque/horsepower - AS LONG AS MINUMUM GAP SPECS ARE RECOGNIZED AND FOLLOWED. In other...
by engineguyBill
Sun Oct 11, 2020 10:40 pm
Forum: Engine Tech
Topic: Top piston ring gap - whats really required?
Replies: 34
Views: 1697

Re: Top piston ring gap - whats really required?

[/quote] If that’s true, why not leave the ring out altogether? The. It won’t butt for sure. [/quote] A well-known crew chief once told me that he was pretty sure that a Top Fuel engine would run much better without any rings. The only problem was getting the engine to start without rings . . . . . ...
by engineguyBill
Sun Oct 04, 2020 11:19 pm
Forum: Engine Tech
Topic: Top piston ring gap - whats really required?
Replies: 34
Views: 1697

Re: Top piston ring gap - whats really required?

.0045" to .0050" per inch of cylinder diameter is safe and will work very well. i.e. 4.000" bore will be fitted with a top ring with gap of .018" to .020". This would be considered the absolute minimum for top ring gap, unless piston manufacturer recommends otherwise (such as Keith Black hyperutecti...
by engineguyBill
Wed Sep 30, 2020 8:22 pm
Forum: Engine Tech
Topic: Piston oil ring support rails
Replies: 3
Views: 282

Re: Piston oil ring support rails

Yes, the oil ring support rail should have the locating tang in order to keep the support rail gap away from the void over the wrist pin. Most of the support rails in the industry are supplied by Perfect Circle/MAHLE and Hastings and I believe that both of them are still utilizing the locating tang....
by engineguyBill
Sun Sep 27, 2020 10:46 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: Cam advice for a mild 327
Replies: 32
Views: 1040

Re: Cam advice for a mild 327

AmericanPie, Welcome to the forum. Of the three cams you have listed, I would go with the Isky cam. The cam is not going to make a huge difference performance-wise in a big car with mostly stock engine and powerglide. I would highly recommend that you install new lifters, springs and valve locks whe...
by engineguyBill
Sun Sep 27, 2020 10:30 pm
Forum: Engine Tech
Topic: LS PM guides, stem clearance?
Replies: 20
Views: 744

Re: LS PM guides, stem clearance?

Valve guide to valve stem clearance of .0024" to .0026" is fine. As long as the stem clearance is within factory specs, all is well. Tightening the clearances is not a good idea, especially if you are running positive valve stem seals. Too little clearance here will cause the valve stems to gall and...
by engineguyBill
Tue Sep 22, 2020 9:57 pm
Forum: Engine Tech
Topic: How narrow can you run an intake seat ?
Replies: 6
Views: 698

Re: How narrow can you run an intake seat ?

Make sure that the valve stem to guide clearance is within specs. Go with the high side of the specs if you are using positive valve seals.
by engineguyBill
Tue Sep 22, 2020 9:44 pm
Forum: Engine Tech
Topic: Connecting Rod Tech.
Replies: 19
Views: 978

Re: Connecting Rod Tech.

It is commonly stated that a connecting rod goes through the most stress as the piston goes through TDC on the exhaust stroke. Most high performance rod manufacturers should be able to provide you with test results that compare 'H' beam and 'I' beam rods, as well as various cap designs and rod bolt ...
by engineguyBill
Tue Sep 22, 2020 9:38 pm
Forum: Engine Tech
Topic: Bronze cam bearings
Replies: 13
Views: 527

Re: Bronze cam bearings

We repaired an antique which had spun its cam bearings. Bore the tunnel straight and oversize, press in and Loctite steel sleeves and drive in standard cam bearings. In our case, we lucked out and there was a Redi-sleeve exactly the OD/ID we needed. We trimmed it to length and left the flange on it...
by engineguyBill
Wed Sep 16, 2020 11:44 pm
Forum: Engine Tech
Topic: Piston rings
Replies: 5
Views: 391

Re: Piston rings

Net difference between your cylinder diameter and your ring set is .007" so you will be able to use these rings. Be sure to check gap and file fit as necessary. You will have slightly more radial tension with these rigs, but not enough to be concerned about.
by engineguyBill
Wed Sep 16, 2020 11:37 pm
Forum: Engine Tech
Topic: Cast rings for nos
Replies: 2
Views: 283

Re: Cast rings for nos

Ditch the cast iron rings and use steel or ductile iron top ring with NOS. Grey ion second ring will be fine, but the top ring is critical.
by engineguyBill
Fri Sep 11, 2020 10:43 pm
Forum: Engine Tech
Topic: Ramshorns..
Replies: 10
Views: 736

Re: Ramshorns..

There is still a lot of restriction in the rams horn exhaust manifolds. Also, as you have pointed out, the center exit often interferes with crossmember and/or steering gear.
by engineguyBill
Fri Sep 11, 2020 10:37 pm
Forum: Engine Tech
Topic: 283 CHEV BLOCKS?
Replies: 25
Views: 5430

Re: 283 CHEV BLOCKS?

Early 283s were often bored to 4.000" with no problems, but anything larger than 4.000" for these blocks would be a crap shoot. Not all 283 blocks have the same amount of material in the cylinders. The castings were reduced in total amount of material (cast iron) around 1962 or 1964 and some of thes...
by engineguyBill
Thu Sep 10, 2020 11:08 pm
Forum: Engine Tech
Topic: Stock Eliminator secrets?
Replies: 231
Views: 13837

Re: Stock Eliminator secrets?

The elimination of bump steer will make a significant difference in the vehicle's dragstrip performance. Bump steer can be very efficiently controlled by relocating steering box and idler arm on the frame (up or down) and by contolling the arc of the tie rod ends to the same arc as the lower control...