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Search found 1665 matches

by David Vizard
Mon Jun 29, 2020 4:54 pm
Forum: Engine Tech
Topic: SAM's SB2 At The EMC And The REC
Replies: 48
Views: 1950

Re: SAM's SB2 At The EMC And The REC

500,000+ dyno pulls = 27+ pulls per day, 7 days a week, 365 days a year for 50 years. Impressive! Once again you have jumped to conclusions based solely on what you guys do. If you had called me I could have given you a good few references of folks who have been with me during extended dyno session...
by David Vizard
Tue Jun 23, 2020 5:22 pm
Forum: Engine Tech
Topic: SAM's SB2 At The EMC And The REC
Replies: 48
Views: 1950

Re: SAM's SB2 At The EMC And The REC

I think some might question my eligibility to guess at this since I have experience with both dyno's. I know the UNO dyno read slightly high for the 2012 shootout as we had an engine on it for another project for my BBC book - all to do with ex pipe lengths. I am sort of hoping some of my critics ma...
by David Vizard
Sat May 30, 2020 6:58 am
Forum: Engine Tech
Topic: Valve spring installed height
Replies: 17
Views: 916

Re: Valve spring installed height

A change in installed height of 0.010" will result in a change in seat FORCE of approx 1.6 lbs and a change in nose FORCE of 1.6 lbs. Springs are always measured in unit of FORCE , never pressure . It is highly probable that the variation in installed seat and nose force, from spring to spring, wil...
by David Vizard
Sat May 30, 2020 6:40 am
Forum: David Vizard forum
Topic: The Venturi effect
Replies: 2
Views: 461

The Venturi effect

I've heard quite a few times of head porters claiming to be using a 'Venturi effect' to improve the flow capability of a port. And so they may be but for the most part you can bet it's just the use of fancy sounding terminology to impress a would-be customer . The reality is this - if you ask them w...
by David Vizard
Sat May 02, 2020 6:35 pm
Forum: Engine Tech
Topic: Pro filer 290 vs Trick flow 280
Replies: 4
Views: 1898

Re: Pro filer 290 vs Trick flow 280

I have tried both heads while researching my BBC book. I don't think you can go wrong with either brand of heads here but you had better have a good idea of how to port them.
DV
by David Vizard
Sat May 02, 2020 6:24 pm
Forum: Engine Tech
Topic: Corona virus work impact
Replies: 20
Views: 1396

Re: Corona virus work impact

Guys,

I pleased to hear from all but I had got the race business in mind here.

DV
by David Vizard
Sat May 02, 2020 3:32 pm
Forum: Engine Tech
Topic: Corona virus work impact
Replies: 20
Views: 1396

Corona virus work impact

Called Tom at 3V Performance the other day and just happened to ask him how business was. As far as I can remember his comment was along the lines of' ' well folks might be dying out the but they want their race engines before anything fatal happens' . As it happens I am in the same boat. Though I h...
by David Vizard
Sat May 02, 2020 2:44 pm
Forum: David Vizard forum
Topic: Scott Foxwell Challenge
Replies: 15
Views: 3368

Re: Scott Foxwell Challenge

Guys it looks like Scott Well has opted out of presenting his case. Looks like his excuse is he asks someone else about cam specs and has as good as admitted he is not a cam specialist. Let me just say you have to be pretty certain of your facts and theories before you publish them world wide as the...
by David Vizard
Tue Mar 17, 2020 7:40 pm
Forum: David Vizard forum
Topic: Scott Foxwell Challenge
Replies: 15
Views: 3368

Re: Scott Foxwell Challenge

Guess what guys??? Other than some sarcastic replies still no word from Scott Foxwell Well, he can't comment here, because he's not a member. Mikey, I am desperate to find out from Scott and possibly others how to spec a cam so I can deliver accurate tech to all those attending my seminars. Can I p...
by David Vizard
Tue Mar 17, 2020 6:35 pm
Forum: General Tech
Topic: Vizard vs Foxwell
Replies: 42
Views: 3229

Re: Vizard vs Foxwell

It would have been interesting to hear Harvey’s take on that testing. Good or bad. My guess on comments Harold has made in the past, that he would have a field day commenting on this whole thing. Doesn’t mean you can design (or should) design a lobe. David used Crane cams early on, as well as other...
by David Vizard
Mon Mar 16, 2020 10:57 am
Forum: David Vizard forum
Topic: Scott Foxwell Challenge
Replies: 15
Views: 3368

Re: Scott Foxwell Challenge

Guess what guys??? Other than some sarcastic replies still no word from Scott Foxwell on if and when here will take up my challenge to him to set me straight on my cam speccing tech. Can anyone tell me why this seems to be the case????

DV
by David Vizard
Sat Mar 14, 2020 2:00 am
Forum: David Vizard forum
Topic: Scott Foxwell Challenge
Replies: 15
Views: 3368

Re: Scott Foxwell Challenge

In my rush to challenge Scott Foxwell to debate his point on cam events in my last post I forgot to mention, out of the list I did give. ie So everything that I planned to do in the last few weeks got put on the back burner. Still here's what I'm attempting to do at the moment. First I had planned o...
by David Vizard
Wed Mar 11, 2020 8:08 pm
Forum: David Vizard forum
Topic: Scott Foxwell Challenge
Replies: 15
Views: 3368

Scott Foxwell Challenge

Sorry I've been out of circulation for a while. Got back from PRI and me, and most of my guys came down with flu'. In my case it proved a little more severe than just flu. It turned out that I was finally diagnosed with flu, a mild case of pneumonia, and bronchitis. The fact that my lungs are largel...
by David Vizard
Fri Feb 14, 2020 2:31 am
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 7297

Re: Minimum Cross Sectional Area: Question

In the real world do you really think if you added more than half a point of compression, you would REDUCE the .050" numbers? Effectively, put in a smaller cam? That's what I'm asking because you said the program suggested a much shorter cam Sure don't sound right to me Hi rocket man - If the CR ca...
by David Vizard
Fri Feb 14, 2020 2:26 am
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 7297

Re: Minimum Cross Sectional Area: Question

Now I see where the misinterpretation is. If you raise the CR and expect a cam spec to follow what we've all come to expect, you have to raise the target peak RPM also. As I said before, keeping the RPM target the same and raising the CR doesn't make sense. So then, neither do the results. The same...