Don Terrill’s Speed-Talk

82bird wrote:I'm just asking if this is common? I'm not saying it is too big. I just haven't seen it break on this side of port in an SBC head. I did not port this

It is can be pretty common on a larger intake volume.

How can you say its too big, too say that obviously you measured it right. ? What is the speed doing there ? A 436 engine demand can need more air than that head can probably flow .

You need to look at getting yourself a REAL book on Weber Carburettors that will tell you how they work. I doubt it will happen with some one relaying the messages on a type writer. Not being rude to you but by what you have already said I don't think you know how they work. The circuts are much mor...

Duckworth was well ahead of most cam designers in the late 1950's Ahead of most "Euro" cam designers, maybe, but he wouln't have made the top 5 in the U.S. Winfield was light-years ahead of him. You also have remember that Phil Irving and the Repcos , and Merv Waggotts 2 Litre motors both...

Re: Mini A-Series Cam Grinders Unread postby Sir Yun » Wed Apr 08, 2015 3:17 ( I think 175 bhp from a 5 porter would be very stiff indeed. According to my maths you would need about a Bmep of 15 or about 109 % ve at 9000 rpm. It also needs about 170-175 cfm. ) The Lightweight car of John Lefflers wa...

I also see Mr Hoffman with quite some miss information, one think I did notice worth mention in the engine builder/part supplier he mentioned referring to 1275/1293 motors making 150+. That is a gain in over 8 to 10 BHP but it has taken from the 142 we used to see in around 1970 in Brian Foley's and...

" lockwire " Back in 85 on methanol 2 Litre @ 9200 was 487 hp. :?: what engine was this :?: The only engine I can think of was Pacific / Atlantic engines .. 1600 cc / 230 - 242 bhp on petrol lada ok Expert Expert Posts: 803 Joined: Fri May 10, 2013 8:20 pm Location: te puke, bay of plenty,...

[quote="Erland Cox"]It depends on valve shrouding. On a 2 valve head you can either use 50% of the bore size or the port diameter / 0.86. If the second calculation gives you a valve bigger than 50% of the bore use 50% as long as the shrouding is OK. A very good head can use even bigger int...

( quote ) Think it's a little more sinister than that! :) Guess he would really freak out with the 347 with single carb, with GM 15º heads that made 870..[/quote] How do you hide the needle marks[/quote] excuse me? Why don't you just come out and say it instead of insulting me, no balls?[/quote] Cha...

alteredu wrote:Rods have one purpose – They connect the crankshaft to the piston – The normal guy, or racer will never notice any difference in rod length.

Your lack of knowedge only shows ignorance. On the same crank 2 different rod lenghs show the same piston speed. Only to You.

To many unknowns. Compression, heads ported or not? Oiling system? cam/valvetrain, what intake? It could be done IMO. Absolutly, its not out of line with the 350 Vortecs I done heads for some years ago for a class in south ga. BHP at 262 ci in 1.6.♦ " Calculators don't work properly. " ??...

( What are the consequences of pairing the WRONG cylinders on a header ) that is how most people do it so there would'nt be a noticeable difference. How ever if you understand what will make the difference it will produce more power if you assemble the primary in the correct manner. The collector is...

I'm not there anymore but some years ago that is what we done and the car won about 33 races in 1 year. get it on the test bed.It doe's not need to be a Holley. sds.

Every where I have seen them they have been a benefit, great. sds

Why stop at a 406? If it were me I would dump the small block all together. Build a 632, after all they are well suited for a mild street strip type engine, plenty cheap to build a 632. Can anyone notice my sarcasm? OP I posted a thread very similar to this a while back because I too ran across a g...