I'm pretty sure the ports on my 240s are American
Polish trick flow 240 ports?
- Thread starter Steve009
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Cojohnso1
Well-Known Member
I dont believe polishing or some rough contributed in any significant HP changes. I believe they are talking about 1-2 HP differences? I also never liked the word "Atomization?" It makes it sound atmonic. When actually it just means closer mixer. The reason why cross rams and tunnel rams got you more? Was because the air and fuel had more time to mix. (I know there is some intake compression wave considerations. But the idea was to better mix air and fuel.)
In advance intake and head design the engineers speak of swirl. Trying to get the mixture to a more swirl pattern. I believe multi valve engines have an advantage here as well.
In advance intake and head design the engineers speak of swirl. Trying to get the mixture to a more swirl pattern. I believe multi valve engines have an advantage here as well.
Cojohnso1
Well-Known Member
To me? If you really want to improve performance? Invent a distributor that can offer real time variable timing? How many of us chase the rabbit of "It idles great at 5°-10° more advanced timing. But then starts drop off in performance or even some pinging at higher RPM?"
Add any boost? And this rabbit get faster. I know MSD has chips that attempt to simulate taking timing out at higher RPM. But what if you really could? It might not be possible to adjust valve timing while engine is running? Too much counter stress on cam. But ignition timing?
Just thinking out loud here.
Add any boost? And this rabbit get faster. I know MSD has chips that attempt to simulate taking timing out at higher RPM. But what if you really could? It might not be possible to adjust valve timing while engine is running? Too much counter stress on cam. But ignition timing?
Just thinking out loud here.
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ChargerST
Well-Known Member
Get a Holley Hyperspark distributor and box (along with EFI) and you can do just that.
Cojohnso1
Well-Known Member
The "EFI" Changes a whole lot. I'm thinking something simpler? Perhaps a rotation dist cap? Electric based on RPM? Slight adjustment to retard as RPM increases? Curve would be set based on build?
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ChargerST
Well-Known Member
A bit off topic from TF ports but check this out: https://progressionignition.com/
This is probably what you want.
IQ52
Well-Known Member
While working with a Captain in the Army Corp of Engineers he once said, "He that tooteth not his own horn, the same shall not be tooted."
I'm quite proud of what we have accomplished and the way we have done it. I was simply tooting my own horn, not bashing other opinions expressed.
I do not wish to have any control over your feelings. Should I have it........I hereby surrender such control back to you.
Jeez Dwayne. Pull the heads off the engine on the dyno and rough them back up? You are a cruel taskmaster!
And when will we find the time to do that? The head porting/prepping shop has to travel 50 miles south this morning to design and then build a custom ornamental iron handrail for a newly constructed home.
Jacks of all trades and masters of none?
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famous bob
Well-Known Member
on the exhaust ports ------yes polish.
if running fuel inj., I`d think all polished , f.i engines have a better quality of fuel mixture to start with--------jmo
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Challenger340
Well-Known Member
I am NOT alone when I say THAT Engine..... and the work done by YOU on it.... was UN-Paralleled and IMO.... UN-Matched and to this day on BB Mopar's Jim !
You knocked it 'outa the Fawking Park !
m79ded
Well-Known Member
my engine guy polished the ports smooth on my TFS240's and it made a difference, Turbulence went away completely and the power did go up significately. Like Tom told me have you ever seen a Pro-Stock or superstock with ribs in them??? I didn't think so. The reason it's there is to keep price down, Go ask very successful, experienced engine builders like Dwayne,Jim, Tom @ TK Race, Ray Barton etc... and you will get the same response.My 451 with a flat tappet and making 12" vacuum got easily over 600 on both sides and a fabulous street engine, well behaved and very street able.
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ChargerST
Well-Known Member
Intake and exhaust ports? or just exhaust polished?
66Satellite47
Well-Known Member
We all may be talking apples & grapefruits here. I've never seen a TF 240 head, so I don't know what the finish is. Having said that, a slightly rough finish is common on the intake port to keep the fuel from re-liquifying on the port wall. That roughness may vary. If TF240's have "ridges", that sounds like an unfinished port to be final finished by an experienced porter.
My intake ports would surely look "polished" compared to a rough cast iron head. Just say'in.
My intake ports would surely look "polished" compared to a rough cast iron head. Just say'in.
famous bob
Well-Known Member
its a more expensive ''add on'' to have them polished , the tool marks are there because polishing will cost more -----------
m79ded
Well-Known Member
Both, but most of the turbulance was on the intake side, The flow bench was bouncing all over the place and after smoothening out it was stable as can be
66Satellite47
Well-Known Member
Again I've not seen a TF240 head but I gather, the intake port finish is from the CNC cutter they use, so it's not a "finished" port. That makes sense.
I used a 30 grit roll on my intakes & 80 on the exhaust.
I used a 30 grit roll on my intakes & 80 on the exhaust.
m79ded
Well-Known Member
Spot on, I haven't seen too many Nascar teams, Drag teams leaving CNC ribs in the heads or even adding them, Look at the best head guys none have those ribs. They only reason they are there is because it costs more to remove them and in order to keep production costs down they leave them. I've seen back to back test with and without the ribs and there was a sizable gain without, I totally agree with IQ52, Barton, MBE Cylinder heads and the likes by removing them. I'm just stating my opinion and real life experiences that can help out our fellow Mopar enthusiasts.
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