Starting with valve and seat work. Back cut valves and multi-angle seats.
Starting with valve and seat work. Back cut valves and multi-angle seats.
I finished up the downpipe and set it back on its wheels this weekend.
burdickjp said:Starting with valve and seat work. Back cut valves and multi-angle seats.
what did you use to cut the seats, and valves??
oldeskewltoy said:what did you use to cut the seats, and valves??
Seats were cut with Neway hardware and valves are the printed prototypes I showed earlier.
If I decide I'm going to back cut OEM valves I'll probably be doing so on a Deckel or similar tool and cutter grinder. Right now I'm considering other options, such as starting from blanks or other valves and cutting the heads down to the correct diameter. All of the valve manufacturers I've talked to have wanted a substantial production run.
burdickjp said:oldeskewltoy said:what did you use to cut the seats, and valves??
Seats were cut with Neway hardware and valves are the printed prototypes I showed earlier.
If I decide I'm going to back cut OEM valves I'll probably be doing so on a Deckel or similar tool and cutter grinder. Right now I'm considering other options, such as starting from blanks or other valves and cutting the heads down to the correct diameter. All of the valve manufacturers I've talked to have wanted a substantial production run.
I like the Newey for what it is... but it is tough to be consistent with seat depths with it.
As far as custom valves... There is a guy here in the Portland area who does custom valves for motorcycles - it might be worth a shot. His name is Chris Shumann from Schuman Motor Works (Milwaukie Oregon)
oldeskewltoy said:I like the Newey for what it is... but it is tough to be consistent with seat depths with it.
It's difficult to be consistent with. Like anything, going slow and measuring a lot gets you 99% of the way there. Once I have my desired angles and widths figured out, I might look for an off-the-shelf cutter with those angles and widths involved, or try to make a cutter.
Most recently I did some bowl cleanup. This was very minor material removal to be able to have consistent dimensions for both intake valves.
A coworker showed me "porting templates". Laser-cut acrylic pieces used for porting on old American V8s. I'm in the process of measuring things out in software to try to put together some templates for my use here. Not sure if I'll get anywhere with it, but it's my current thought.
YUM YUM
HT07-4A on the right. I pulled it down and measured the wheels.
In reply to burdickjp :
They're so tiny...
In reply to Recon1342 :
Not to derail, but here's mine, upper left, with hot plus cold side, plus dollar bill for scale, and ma-hoosive oversized performance tubular manifold for context. Yup, these cars are tiny. 
How about some measurements?
In reply to burdickjp :
Awesome; thanks for sharing!
I picked up a new handheld scanner. I tried it out on the Cappuccino exhaust manifold. It seems to be working alright. It's no Romer arm or CMM, but it gave me what I was asking for. Next is some engine bay scanning and wheel well scanning.
I also picked up some big injectors. I've started into tuning the PNP with these. The idea is to provide a recipe for bigger turbos. The stock injectors are close to maxed out with the stock turbocharger at 1.1 BAR of boost. These are 450 cc injectors from Deatschwerks. I'd much rather have actual, factual Denso injectors of a known Denso part number, but had a devil of a time trying to find some.
Valves on the outside are stock Suzuki F6A. Inside are replacement valves for something else. My intention is to cut them down to make oversized valves. We'll see how this goes.
Been waiting on these for a while!
They're 68 mm in diameter, bringing total displacement to 720 cc.
I have put together a fixture for machining operations on the block. Material will be a little while to arrive.
Nice; I like the machining setup! Also, congrats on making the magazine!
I read the full thread, but maybe I missed it. With these power boosts are there any plans for the transmission? I thought I read it didn't have a lot of margin.
It is great to see people putting energy into these. I got mine in late 2019. Even in stock form it puts a smile on your face.
I have not installed it, but when I first got mine I bought a small inline air to water intercooler that I thought would go well right in front of the engine to shorten the air charge path. One of my other turbo cars has an air to water and I really like it. Have either of you considered this?
I'll keep watching for further updates, keep up the great work!
-Eric
In reply to slatebrick :
I'm gambling on the power adders moving the power band up some, where it's a bit safer. I'm also not going completely crazy. I have a spare transmission to go through and work on as well. Maybe there's some things which can be done to add robustness.
I am considering a water to air intercooler for the same reasons you are. It's not like the charge air path is all that long on these cars, but there are other advantages to water to air intercoolers as well. The one thing I'm hesitant about is added weight.
Just curious, any further progress on this? I had been following along quietly, and was very much looking forward to the power numbers and driving impressions when the car was back together. Love the work, and the detailed graphs on flow improvements.
Hey JP! I sent you an inquiry through your website. Really enjoyed reading your progress here.
I hate when you go through an awesome thread and it ends with cliffhangers
Would love to see some updates here, but I know JP is a busy guy. I think you may find more recent info on his KeiSport website.
I got my 94 limited model on the road early this spring. I've been driving it every chance I get all summer.
Contrary to what the service book says (and JP did it by the book) I find it easier to go out the top with the motor and leave the subframe and transmission in place.
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