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| Slant 170 engine info https://slantsix.org/forum/viewtopic.php?t=65025 |
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| Author: | Dodge33 [ Sat Jun 20, 2020 8:57 am ] |
| Post subject: | Slant 170 engine info |
Hello Guys and gals, I am looking for information on a /170 engine. This 63 Valiant will just be a good driver/road car, so I want to raise the compression up for more get up and go. I am thinking stock compression is 7:1 and I want at least 8:1 compression. Do they make/have a piston available for this? How much can the stock head be milled safely? Thanks for any and all responses! Dodge33 
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| Author: | hyper_pak [ Sat Jun 20, 2020 6:49 pm ] |
| Post subject: | Re: Slant 170 engine info |
Het Dodge33! Are you going to rebuild the engine? A simple compression bump can be obtained with a 70-90 slice on the cylinder head. High compression pistons will be much higher compression than your 8 to 1 number. With the head shave all your parts can be used, push rods, etc. |
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| Author: | Dodge33 [ Mon Jun 22, 2020 4:56 pm ] |
| Post subject: | Re: Slant 170 engine info |
Quote: Het Dodge33!
Thanks for the reply hyper_pak.... yes, it will be a full and complete rebuild, everything new.Are you going to rebuild the engine? A simple compression bump can be obtained with a 70-90 slice on the cylinder head. High compression pistons will be much higher compression than your 8 to 1 number. With the head shave all your parts can be used, push rods, etc. The block has been bored, rods checked, crank turned & polished, holes chamfered, etc. Thanks very much for your response! Dodge33
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| Author: | Doctor Dodge [ Tue Jun 23, 2020 11:37 am ] |
| Post subject: | Re: Slant 170 engine info |
Measure what you currently have and then "run the numbers" on an on-line compression calculator. I like the one at the United Engine & Machine website: https://uempistons.com/p-27-compression ... lator.html Here are the stock 170 numbers to get you started: Head Chamber = 54 cc Piston Head = 0 Gasket Thick = .04 Gasket Bore = 3.5 Bore = 3.400 Deck = 0 Stroke = 3.125 Rod = 5.7 Intake Close = 50 This gives an 8.7 static compression and 7.6 Effective Compression Ratio 3 of the above numbers have a big influence on the outcome" Head Chamber is likely bigger then the 54 cc I used above. Your Bore will be bigger if over-bored. (3.460 = .060 over-size) Intake valve closing point is camshaft & cam phase specific (50 is a good guess on a stock cam) Change the bore from 3.4 to 3.46 and you get a .2 of a point compression increase.  Change the head chamber number to 58 cc (more likely) and you loose .5  The point: a 170 is more sensitive to changes then the 225 so Measure AND Calculate carefully so you end-up with the results you want. DD |
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