JC,jcisworthy wrote:If someone offered a professionally ported loaner set of E7TE heads, that represents a substantial charity for this test.David Vizard wrote:Question- is the dyno testing of these ported heads by some one else going to be paid for by that someone else or should it be as a charity deal by me?jcisworthy wrote:So these heads are going to be dyno tested against stock heads? What about ported heads from someone else?
Just asking so I know where I stand here.
DV
I know time is money.
I was just wondering the test was going to include a set of E7TE heads done according to your port energy techniques and a set done by someone else who does not use it for comparison purposes.
The situation that exists here is that nothing actually costs 'nothing'.
For over 20 years I had my own dyno. When I moved to Charlotte my good friend Don Losito gave my workshop space in his facility and along with that use of the equipment. This included three flow benches, a 2000 hp dyno, a spintron and machinery such as mills, lathes, even a jig borer. But when dyno and spintron rental dropped those machines were the first to go. But my good friend Terry Walters stepped in and offered help towards producing my books and articles on a 'lets trade' basis. The end result is that Terry and I work out the cost of dyno testing on the basis that if it is needed solely by me for say the final test of a build that will be sold right after the dyno testing.Under such circumstances the dyno testing costs me is $500 a day. This also goes with a post dyno test tear-down inspection to establish all is well. The engine is then reassembled in Terry's shop and carries a warranty. That costs me a further $1500. So, at the very least a days dyno testing for my stuff results in $500 out of my pocket.
If it is a joint research deal Terry picks up all the cost. If it is a case of book/article parts testing on one of Terry's motors then the cost to me is $400 a day which I then work off in trade specing out engine builds, porting or making up simple special tooling etc.
The bottom line here is that testing a set of heads for another head porter would be the same as my walking into some engine shop and asking for a free dyno session on one of their engines just because I have a set of heads I think would be worth testing. What would the likely response be? Probably something along the lines of 'Yes we can do that. Dyno rental is $650 a day and the rental on the test engine is $150 a day'
So similarly the tests of this porters heads would be a minimum of $400 out of my pocket and I might also point out that the FREE info I give out on this forum costs me money to give you guys. I have to draw the line somewhere.
But if I take on the testing of this guys heads there is more to it than just a dyno test. Remember these E7TE heads were done with a mind to not break into water. Charlie could have got more airflow but only at the expense of a possible break through. This means the the first move would be to send the heads to Charlie for him to sonic test for wall thickness to establish we are not about to dyno test a set of 'flyers'. Next they would need to be shipped to me for comprehensive (about 4 hours) flow bench analysis. From here on up to Terry's shop for the best part of a days dyno testing.
Why a day just to check some heads? Well the fact is in such a case the only fair test would be the optimize mixture and ignition timing as well as cam timing. Also the flow bench tests might very well show the cam that works best with a Carnut1/DV head may be well off the mark for our head porters heads. Would the results be valid if the tests were not with the optimum cam in each case - I think not.
So here we can add a cam change to the equation and the cost of a cam. See how it is mounting up. Now if your head porter is willing to support the costs that I normally have to support to get my results I will be ready to go in a few weeks. If not this goes nowhere.
Another scenario here. It might be a long shot but what if the cylinder heads fail drastically. I am sure your head porter won't want the results put out to the public. If I am covering costs they are my results not his so I can make them as public as I want. If he is paying for the tests then they are his results not mine so he retains total control of who should or should not see them.
So now you have a more full picture of the ituation I welcome your comments.
DV
There will be a lot to learn there. Very similar port volumes, very similar flowz, different valve sizes etc. Same shortblock, same dyno.