All CFM readings were taken on the same flow bench by me during the month of April 2020.
Lightly Ported as Received Original Cylinder Head
Lift Intake CFM Exhaust CFM
100 66.6 64.0
200 118.9 100.7
300 157.9 116.8
400 169.6 127.1
500 179.4 134.5
600 176.2 134.8
RMI Development work of Porting and Flow Testing the above Original Cylinder Head
Lift Intake CFM Exhaust CFM
100 64.3 77.4
200 122.7 124.3
300 170.2 158.4
400 195.1 174.0
500 205.3 184.2
600 212.7 184.4
“The Other” potential Back-Up cylinder head. As Received Ported, Polished and Finished Cylinder Head
Lift Intake CFM Exhaust CFM
100 51.1 58.7
200 91.7 82.5
300 102.5 94.1
400 109.7 97.7
500 116.9 100.0
600 120.6 99.2
“The Other” cylinder head is what spurred this article and is from a Shop that specializes in this particular cylinder head type. I do not focus on these particular heads, but forty years’ experience in Air Flow Work and Porting has taught me to Concentrate, Think and to let the port tell me what it needs. I try and learn from each and every job.As I stated at the beginning of this tome, this article is about Learning, Experience and Thinking before you Spend.
In closing, the human mind is one of the most amazing things in the universe. Do not let yours go to waste. Again, experience matters.
Don Redmon
Replika Maschinen, Inc
Instagram.com/replikad/
Sources, Assistance and Encouragement
Chris’ Precision Machine
123 Lee Road Unit F
Watsonville, Ca.
1-831-761-3344
On FaceBook @Chris’s Precision Machine
On Instagram@ Chrisprecisionmachine
CTP Cryogenics
2909 Oregon Court Unit C2
Torrance, Ca. 90503
818-445-3030
bentzion@ctpcryogenics.com
Elgin Camshafts
1808 Empire Industrial Court Suite D
Santa Rosa, Ca. 95403
707-545-6115
Harold Bettes
Harold is a consultant on Testing and Engine matters at Power Technology Consultants
http://www.powertechnologyconsultants.com/
Harold’s book “Engine Airflow” is a must read for anyone wanting to know more on this subject
https://hotrodenginetech.com/engine-airflow/
https://www.summitracing.com/parts/hpb-hp1537
https://www.amazon.com/Engine-Airflow-HP1537-Practical-Performance/dp/1557885370
Replika Maschinen, Inc (RMI)
Watsonville, Ca. 95076
831-359-0863
-By appointment only-
https://www.replikamaschinen.com/
Instagram.com@/replikad/
20 comments
in your opinion, how does a reasonably informed person that does all their own work find a company (generally in another state) to perform tasks that the average person cant due to time/tools/knowledge etc. apart from reading reviews and looking at websites, can accomplishments even speak for a company (fastest this, highest hp that)?
great article!!!
Talk to local club racers who aren’t sponsored. A general consensus will leaf you to a few, then interview the shops to see which one seems like the right fit for you.
Thanks!!
Good advice…see my response to the first comment.
Than you, Don
I would look at what results people get with products or services.
thats kind of been my mo so far
Hello Wes, and others. Thank you for the comments.
These comments have brought up some excellent points. Where do you get machine work done? As the world has evolved (?) into a Wal-Mart mentality. Don’t fix it. Just throw it away and buy a brand new and less expensive model mentality. There are fewer and fewer automotive machine shops still in operation. As few schools teach “Industrial Arts” such as Machine, Metal or Wood Shop any longer. Few students/young people get an introduction to any type of Blue Collar occupations. So fewer young people get involved or learn trades in order to replace an aging work force. Hence a lack of Automotive Machine Shops in the US. To the best of my knowledge there are now only two full service automotive machine shops in our entire county. Be aware!!! Street and Racing Automotive machining requires different operator mentality and different machine and shop quality. They are two different things with two different levels of craftsmanship and tolerances.
If you are into “Street/Track” orientated cars. I would suggest attending local Cars and Coffee event in your area. Most car/bike people are approachable and willing to share knowledge.
If you are into various forms of racing, Drags, Road-Racing, Drifting, Land-Speed Racing. Whatever. Attend events in your area.
For example; Here in California there are many different Drag Race events. California’s NHRA Division 7 holds a number of two day events yearly. Pick an event, attend and walk around. See who has a car or bike like yours or one that you would like to build. BUT!!! Do Not go on Race day and expect people to stop what they are doing to talk to you. No matter the type of racing that you do or that you want to be involved in. Go on the first day of a two day event when applicable. People will be much more relaxed, approachable and more willing to talk.
Circle Track type events only allow fans into the Pits to talk to drivers/crew after the race is over. No matter the event type. Cary pen and paper with you to write down information. Formulate your questions BEFORE you speak. “Would you mind telling me who does your engine work? Would you have their contact information?” Etc. Above all no matter the type of racing or event. Be polite and listen. When you are trying to get information, do not attempt to convince the people that you are speaking to how “Bitchin” you and your car/motorcycle are. SHUT UP and LISTEN
Thanks, Don
This is what i did when i was tracking sportbikes. it just so happend a well respected shop happened to be where i live (charleston). But as i embark on rebuilding my old honda into something respectable for an old guy (37 lol), the shops around me focus on big block 1/8th mile drag cars and therefore aren’t familiar with 90 japanese engines. Thanks again!!
Thank you Wes,
That is a problem that one encounters with most automotive machine shops when trying to get machine work on motorcycle engines. Most automotive machines were not designed to accept motorcycle engines. Additionally most automotive machinist are not used to working or have the finesse to work on smaller and more exacting engines. That is why I made the comment about Street Shops and Racing Shops. There are differences.
Don
While using a local, to your area machine shop is convenient. Our national shipping systems are reasonably competent when it comes to moving packages and goods from one place or one state to another.
A lot of my work comes from outside my area and out of my state. There are fewer shops in the country now due to reasons that I have listed previously.
High end shops are becoming harder to find. Unfortunately, the days of the corner machine shop are pretty much over. Back when I was a kid and the Flintstones were real.
Auto machine shops usually drag or circle track raced a car. Local motorcycle shops Flat Tracked, Road Raced or raced Rough Scrambles. That was a few years before Motocross appeared.
In other words. Shops were owned and operated by ENTHUSIAST!
The price of the machines now required to machine engines has risen exponentially. Any good CNC machine is $100,000.00. The high end machines are double to triple that.
A shop needs to process a LOT of work to pay for these machines and the personnel to operate them. Spare time to work on shop projects and race vehicles becomes a premium.
So, as Mike said absolutely educate yourself. The more that you know and understand, the less likely your chances of being ripped off and the faster and more reliable your vehicle will become.
Attending race events is also educational if you are serious when you go there and study and observe.
Get off your cell phone and read some BOOKS!!! David Vizard, Harold Bettes and others have numerous books on race engine blueprinting, engine machining of blocks, cylinder head work, improvements and testing, etc.
The SAME machining and assembly procedures that are used to Blueprint a 350 Chevy V-8 apply to a Honda inline 4 or an RB-26 inline 6 or a Suzuki GSX-R1000, etc.
Our brains process written and on-line information differently. You Tube videos are NOT books.
The proliferation of “Experts” on You Tube is ridiculous and far often miss-leading. Owning a cell phone that can video does not make you an expert.
The 2016 election of the Insane Klown Pose to the executive branch should prove that.
Don
I would just do the hard time and learn it the proper way: Educate yourself with the right education en literature. And in case your generation Y (read: WHY ) set up the serveice terms in advance before buying. A good company stands by their own products. In a sense they should be proud of what they’re doing. So if there is a mishap in quality control, after showing them what you got, they should acknowledge it. So for something thats done the right way the testing mishaps around the SSC Tuatara.
Have seen plenty of these mistakes in my lifetime, so you can count me in on the angry old dudes clubs.
As for the white stuff: Thats most likely calicification from cleaning using tap water with high amounts of chalk, limestone/gypsum. In general: “Hard Water”. It would also explain the rust bubbles
Hi KS and thank you,
Gen Y or any other Generation has to learn and that takes time as does experience. My hope for all of the articles that I write is to pass on some of what I have learned in now 45 years in this profession. To also encourage younger people learn and spend the time necessary to gain experience. So while the focus of my response was about finding a good machine shop. I know that while attending racing events that young people will learn via observation, listening and thinking about what they are seeing.
I have no real knowledge of Drifting. But were there a need for me to gain more knowledge of this segment of motorsports. I would attend a few Drifting events. Observe and ask questions. So my suggestion is to do what I would still do.
The “white fuzz” and rust was more pronounced in person than what is evident in the photograph. I took those pictures back in 2002 with an early generation digital camera. How Mike and company were able to resurrect them is a minor miracle. When I first saw the cylinder head. My first reaction was that they left the head sit outside in Ohio or some other rust belt stat over the winter. Regardless, what sort of a company sends out a “Finished” cylinder head like that to a customer?
Don
Not the right company, but most likely a company of more then one person, but not a big company that has quality control. Or its a very large company where the old adage goes: Pay peanuts, get monkeys! In other words: an unmotivated workforce.
When you use water on heads but dont dry them and leave the out to dry on their own thats what will happen. Im guessing its mostly on one side. Have seen that heaps of time on my side of the pond.
As for writing and passing on the info: I hear you, but as far as i can tell the current generation isnt really up for that anymore: Instant gratification is the key word. “I want it, i want it now, and i dont want to think about it. “Thats what sums it up…. To me it seams that after about 1988 that mentality started to change. Let alone the mentality know.
Hey I was going through a tough time when I did that work. My dog had just broken up with my and my girlfriend ran away so it was hard to focus at work. Give a guy a break!
Sorry to hear that. I hope that your dog is better now.
Don
Hi Don, would you please qualify your comment: “To the best of my knowledge there are now only two full service automotive machine shops in our entire county.”
There are lots of shops that do head and cylinder work, so are the operative words in your statement “full service?” In other words, there are only 2 shops in the US that have the ability to service/machine every single component on your car? E.g., “We are a shop that does every single type of engine work you can think of – head work and even rewelding/machining crank main journals plus transmission work.” Or, what do you mean when you say “full service?”
Hello tbasic1 and thank you for your comment,
County as in LA County, San Diego County, Travis County, etc. Not Country.
In the county that I live in. There previously were approximately six (6) full service automotive machine shops in this county. There are now only two full service shops and two partial service auto machine shops. The partial service machine shops machine brake rotors and drums, some will perform single angle valve jobs, etc. This is not full service.
Full Service to me is having the machinery and the ability to bore and (properly) home an engine block. Surface blocks and cylinder head and properly do multi angle valve jobs, etc.
I hope that this clarifies what I wrote.
Don
Doh! Thanks for the clarification, Don. I did indeed misread.
I’d honestly like to know what the machine shops said when the photos/flow numbers were sent there way with a “WTF?” message with it.
What’s their response to being called out for their shabby work?? Because I know I’d call them out for it…especially so with it being a $$$$ expenditure.
Hello Superstar!!!
The shop was not contacted by us but the customer may have spoken to them. I was asked to look at the head but was not directly involved with the customer.
My friends at the machine shop where that customer initially took the cylinder head, fixed the problems. They cleaned up the cylinder head, blasted the rust and gunk off then steam cleansed it.
I do not remember if they had to redo the valve job but I am pretty sure that they did perform a very light resurface pass on the cylinder head deck.
Modern head gaskets do not like decks that resemble giant grooves from 33 and 1/3 LP’s or a piece of rough cut lumber.
Don