Question for 170/6 Tuning

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dimagg

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Hello,
I´m thinking of putting a Offy Intake with a 4 bbl 500 cfm Edelbrok Carb
on my 170/6 stock motor and changing the oem exhaust to 2 1/4" tubes.
Do you think that´s a good or a bad idea?
Thanx for your comments
dimagg
 
sounds like a good start! im a holley guy but if you know how to tune an eddy go for it. also while uo have it apart i really recommend cutting the head .090" and doing some bowl work, replace the seals
 
Hi moparkid,
thanks for your reply, but what do you mean with bowl work?
And dont you think the Carb will be to big?
greets
from Germany
 
dimagg said:
Hi moparkid,
thanks for your reply, but what do you mean with bowl work?
And dont you think the Carb will be to big?
greets
from Germany
Click to expand...

those style carbs have an air door so it wont allow more than I needs. for a very basic slant a small 4 closer to 400 would be better but I think if you tune that eddy properly it will work fine.

in the cylinder head you have the valve seal where the valve closes and seals to keep the cylinder pressure contained, the area just under the valve is known as the "bowl".

what are your plans for this motor/car? daily mpg?
 
well,I use it from Mar/Apr to Oct/Nov as a daily driver , but I want a "little"
bit more performance and sound :D but it should still be at a relatively low
price at the gas station
 
dimagg said:
well,I use it from Mar/Apr to Oct/Nov as a daily driver , but I want a "little"
bit more performance and sound :D but it should still be at a relatively low
price at the gas station
Click to expand...

ok so smaller the 4 barrel the better, I think a 390 would be perfect but they are hard to get...

compression bump, general cleanup on the ports and bowls. As you said 2.25 exhaust to the muffler, then 2.5 after to the bumper. it is all a good start but your also going to need to upgrade the ignition for a better bang.
 
yep, I thought of the Pertronix System 1361A Do you think that`ll be good?
But why should I get bigger after the muffler? I would have it made 2 1/4"
the whole way or after the muffler 2". :sad5:
well and another idea instead of the 4 bbl carb is a super six setup
 
dimagg said:
yep, I thought of the Pertronix System 1361A Do you think that`ll be good?
But why should I get bigger after the muffler? I would have it made 2 1/4"
the whole way or after the muffler 2". :sad5:
well and another idea instead of the 4 bbl carb is a super six setup
Click to expand...

what year is your car? if its currently points then yes get the ignitor II and install this coil while bypassing the ballast resistor. if its not a points car everything still applies but you don't need the conversion kit.

http://www.summitracing.com/parts/pnx-60130/overview/

then i would run the Standard CH410 cap, a brass tip rotor and Ebay 8.5mm wires

http://www.ebay.com/itm/261045845276?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

for the exhaust run 2.25 from the manifold back to the muffler, then 2.5" from the muffler to where ever you exit/stop
 
My Car is a ´71 Valiant but with 170 ci Engine cause it´s a swiss modell.
And thanks for your help
 
dimagg said:
My Car is a ´71 Valiant but with 170 ci Engine cause it´s a swiss modell.
And thanks for your help
Click to expand...

interesting! the .090" was for a 225 so your going to have to CC the chamber, figure out how far below deck the piston is then figure out your current and future compression using this

http://wallaceracing.com/cr_test2.php

cylinders: 6
bore: is 3.400 unless its been bored (measure when head is off)
stroke: is 3.125" for 170
Head CC's: (stock were around 53-58 but you more worried about final CC's)
Valve relief/dome: (stock) 0
Gasket thickness and bore: (stock was 3.400 by .021 thick compressed) (most aftermarket ones are 3.510 bore by .021 (steel) or .037 (felpro) so you need to get it in hand before milling)
Deck height: with the piston at TDC you will measure to see how far down in the hole the piston is. but it looks like stock 170's are zero decked

so stock your probably at a 8.5 or so, I would recommend about a 9.2-5 compression, but what is your octane there?
 
The head cut will help increase the compression, but you need to remove your head and measure the piston to deck height to calculate your dynamic compression ratio with a cut cylinder head. To do it right you need to measure the cc's on your stock head. Something to consider, if the head has had a few valve jobs, then the seats will be sunk into the head giving you a larger chamber volume. New, larger valves, will put the valves higher in the chamber, and a smaller chamber volume. It's a vicious circle! Good luck with your 170, there aren't many of these being run now a days!
 
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