Piston and Rod Combos
Le Mans Master
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From: All humans are vermin in the eyes of Guru VA
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Correct. In a theoretical best case with drag tires according to the computer. I dont find it likely. But I think the important thesis is that both transmission/rearend combos both perform well.
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From: All humans are vermin in the eyes of Guru VA
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So what would you guys think about switching to flat tops and iron heads?
A little heavier but the iron eagle platinums flow A LOT.
The compression would be 10.4:1 with a DCR of 7.25:1
A little heavier but the iron eagle platinums flow A LOT.
The compression would be 10.4:1 with a DCR of 7.25:1
Le Mans Master
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Can't beat a flat top piston dome pistons suck, if you can avoid a domed piston to get the compression you want go for it.
Last edited by Little Mouse; Oct 6, 2008 at 07:38 PM.
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From: All humans are vermin in the eyes of Guru VA
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So I have a (used) set of 396 stroker pistons (3.875" stroke, 4.030 bore) they are in theory 1.0625 in compression height.
A set of 355 pistons for a 6.2" rod has a compression height of 1.061 from KB
So my 396 pistons have .002 more compression height. But if I deck my block to say 9.003 I should be good.
And on top of all that I just need a 270 buck set of rods and some rings and my rotating assembly is good to hook.
Should be a good match to some iron eagle 200 heads.
A set of 355 pistons for a 6.2" rod has a compression height of 1.061 from KB
So my 396 pistons have .002 more compression height. But if I deck my block to say 9.003 I should be good.
And on top of all that I just need a 270 buck set of rods and some rings and my rotating assembly is good to hook.
Should be a good match to some iron eagle 200 heads.
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From: All humans are vermin in the eyes of Guru VA
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This is fun.
Exact same intake valve closing angle
http://www.carcraft.com/techarticles...o_results.html
(the motor in this article had a DCR of 7.65:1 based upon my calculator)
Exact same intake valve closing angle
http://www.carcraft.com/techarticles...o_results.html
(the motor in this article had a DCR of 7.65:1 based upon my calculator)
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From: All humans are vermin in the eyes of Guru VA
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What do you guys think about rings?
I am leaning towards the Total Seal Classic Racing Rings (CR369030)
I am leaning towards the Total Seal Classic Racing Rings (CR369030)
Last edited by Guru_4_hire; Oct 7, 2008 at 08:51 PM.
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From: Millington Illinois
St. Jude Donor '08-'09
This is fun.
Exact same intake valve closing angle
http://www.carcraft.com/techarticles...o_results.html
(the motor in this article had a DCR of 7.65:1 based upon my calculator)
Exact same intake valve closing angle
http://www.carcraft.com/techarticles...o_results.html
(the motor in this article had a DCR of 7.65:1 based upon my calculator)
Le Mans Master
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From: Little Rock AR
Are you basing your intake valve closing point @ .000 lift or .050 when you do your DCR calcs? As I said before my 383 motor at 10.4 comp and with a 236/242 cam DCR is 8.28. Your calcs are showing over a full point higher Comp ratio @ 11.5 with a 234/242 cam and less DCR @ 8.1. Math don't seem right.
if he is using 79 ABDC intake closing angle I think he is doing it right. I did the DCR model just for grins.
-Mark.
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From: All humans are vermin in the eyes of Guru VA
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Are you basing your intake valve closing point @ .000 lift or .050 when you do your DCR calcs? As I said before my 383 motor at 10.4 comp and with a 236/242 cam DCR is 8.28. Your calcs are showing over a full point higher Comp ratio @ 11.5 with a 234/242 cam and less DCR @ 8.1. Math don't seem right.
Crane Lobes are funny shaped btw.
At the advertised duration they have an ICL of 111 but at .05 they have an advertsied ICL of 107.
Here is the cam card.
http://www.cranecams.com/index.php?s...41&lvl=2&prt=5
Last edited by Guru_4_hire; Oct 8, 2008 at 09:14 AM.
Burning Brakes
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From: Iowa
For a dual purpose engine I would run the Total Seal "Max Seal" ring set with a gapless top ring and a standard tension oil ring. Once you do the work to install them you will love them; plus they will keep oil consumption down, and cylinder pressures up.
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From: All humans are vermin in the eyes of Guru VA
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Interesting.
They are kind of expensive though. Why not be the first kid on my block with gapless rings? I dont have to buy pistons anymore.
They are kind of expensive though. Why not be the first kid on my block with gapless rings? I dont have to buy pistons anymore.
Last edited by Guru_4_hire; Oct 8, 2008 at 01:00 PM.
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From: Millington Illinois
St. Jude Donor '08-'09
Advertised duration.
Crane Lobes are funny shaped btw.
At the advertised duration they have an ICL of 111 but at .05 they have an advertsied ICL of 107.
Here is the cam card.
http://www.cranecams.com/index.php?s...41&lvl=2&prt=5
Crane Lobes are funny shaped btw.
At the advertised duration they have an ICL of 111 but at .05 they have an advertsied ICL of 107.
Here is the cam card.
http://www.cranecams.com/index.php?s...41&lvl=2&prt=5
Le Mans Master
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Guru do you already have rods ? I'm probably going to get flamed for this but I just read something kind of blew me away. Jack LaLanne now 93 did the TV show for 34 yrs, at the age of 42 set a world record for pushups 1,033 in 23 minutes, at 70 pulled 70 boats through the water with one person in each boat 1.5 miles with his hands handcuffed feet shackled. I knew a about the boat thing but 1,033 pushups in 23 minutes at age 42 increadible.
Last edited by Little Mouse; Oct 8, 2008 at 03:00 PM.
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From: All humans are vermin in the eyes of Guru VA
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Guru do you already have rods ? I'm probably going to get flamed for this but I just read something kind of blew me away. Jack LaLanne now 93 did the TV show for 34 yrs, at the age of 42 set a world record for pushups 1,033 in 23 minutes, at 70 pulled 70 boats through the water with one person in each boat 1.5 miles with his hands handcuffed feet shackled. I knew a about the boat thing but 1,033 pushups in 23 minutes at age 42 increadible.
I want a set of scat 7/16 capscrew I beams in the 6.2" length. $259 from Flatlander
Le Mans Master
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stroke crank .043 ring width piston. I will sell you a new set of eagle H-beams 6.250.
Le Mans Master
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Back in the 70s when people were mostly using factory parts when I had my 66 shared a shop with a friend that had a 69 camaro it had a ford nine inch rear end if I remember right 4.57 gearing, we built a 348 size small block for it, the old angle plug 292 heads, chevy off road solid cam, used a 400 4.125 block 3.25 large journal crank special main bearings to fit the 2.45 crank in the 2.65 400 block.The 4.125 bore must have really helped unshroud the 23 degree valves, it ran far better then any of the 3.48 X 4.030 355s we had built.
There is a difference in air flow when they test these modern heads, the same head on a 4.030 bore will flow less air through it then when its tested with a bigger bore.
There is a difference in air flow when they test these modern heads, the same head on a 4.030 bore will flow less air through it then when its tested with a bigger bore.
Last edited by Little Mouse; Oct 9, 2008 at 12:37 AM.