My Road Trip Motor Progress
modnrod:
Quote from: ESchey56 on November 21, 2012, 17:37:05 pm
. Rick is a good customer of ours and sometimes he forgets where he buys his parts :) :)
Thanks
Mike and the C/E crew
HAHAHA! I used to be a parts guy for years. I had to remind friends where they got stuff from occasionally too! :)
Just read the whole thread. VERY, VERY cool Rick, especially since I now know my cam/comp/flow combination should work well, since you've just made everything (size of motor, port CSA/valves, chamber, etc) a bit bigger then tested it for me.
Thanks for that. ;D My temps and climate are very similar to yours, just a bit warmer, both summer and winter.
I hadn't considered a "semi-hemi" as such, my own experience on V8s both as streeters but also drag street sedans is that the Ford 302 Clevo closed chamber works better than the open chamber, and the old Holden slant wedge chamber does the same compared to the newer open chamber Holden heads, so I hadn't really considered anything other than a blended very small chamber. I did however, want to modify the chamber shape a bit, I had envisioned a similar but smaller chamber shape and blending, but out on the plug side, and by using a screw-in insert into the spark plug threads and 10mm plugs also pull the plug back out of the chamber by 5-10mm. It's all in trying to centre the plug and "squish" the mixture into it, but by avoiding if I can doing any welding on the chamber or the heads. The "bathtub" would end up looking more like a "heart" with the plug in the tail.
Just to make it even more interesting, the chamber will need to CC out at about 48-50cc.
Second opinions, or am I overthinking the thing.........yet again!
rick m:
I don't believe you are overthinking your ideas. I spent 3 months thinking through my cam selection (lift, valve opening and closing numbers, overlap) the size of the ports, the size of my venturies in my 48 IDAs, chamber design, exhaust size, etc. It all worked out just as I wanted it to. I like to take the time thinking about where I plan to drive the motor, what I am using it for, etc. Otherwise you end up building something that is an irritating experience.
Rick M
modnrod:
Yeah, that sums it up. My aims are similar to yours, hence the similarity of parts chosen.
I pick the rev range I want, then the duration to suit, then IVC and overlap to suit comp and octane, then the smallest ports and valves I can get away with to feed it all. This is for a streeter, and I don't have any traffic lights within 200miles to encourage me to go bigger! :D
Head chamber shape, and how the biasing suits the bowl entry and seats is where I'm at now, so your thread is right on time.
Zach Gomulka:
Quote from: modnrod on January 18, 2013, 02:44:54 am
My temps and climate are very similar to yours, just a bit warmer, both summer and winter.
Where in the hell (literally) do you live?? Not many places hotter than here in Phoenix.
modnrod:
Gday Zach.
It's not that much hotter really.
I live 200 miles north of Perth WA. It's about 100miles from the coast and inland, and at 29*South. Anywhere in Oz that's further north than 30*South, and further inland than 100 miles, has similar temps give or take a couple of degrees. During the summer, it's mostly mid-20s*C overnight, and mid-40s*C during the day. I leave work at 2:30pm, and usually ride into a 20mph headwind/crosswind and the mid-40s.
Plenty of places hotter than here though. In the Gulf (Iran/Iraq) I remember the temps getting over 50*C (which it does here a few times a year) for 2 weeks in a row.........125F every day, phew!
Anyway, my little 1700-ish motor has to push my Superbug through the wind and up and down rolling hills in this for an hour at 65-70mph, hence the focus on the little details of deck height/chamber shape etc.
If I ever moved to the US for work, I've already told the "powers-that-be" that Arizona and New Mexico is fine thanks! Just like home!
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