3/8 Pushrod Clearance on Unmilled 243
07-14-2013, 11:34 AM
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3/8 Pushrod Clearance on Unmilled 243 Doing a lot of searching only found 1 or 2 guys running them but threads are old
Is there clearance for 3/8 Pushrod On Unmilled 243 ?
Going to give Manton a call mon morning forgot to call last week
Is there clearance for 3/8 Pushrod On Unmilled 243 ?
Going to give Manton a call mon morning forgot to call last week
07-14-2013, 12:23 PM
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Why not ?
Why not spend little more for extra valve train stability
Seems like win win to me might be overkill but it's not like I'm going to be spending $$$$$
Why not spend little more for extra valve train stability
Seems like win win to me might be overkill but it's not like I'm going to be spending $$$$$
07-14-2013, 12:58 PM
#6
As long as you drill out the pushrod hole you can run 3/8 PR's all day long. Also there are .110" walled 5/16 Pushrods that are extremely stiff. PR flex can beat **** to death.
Last edited by 3rdCoastPowerSports; 07-14-2013 at 01:04 PM. Reason: forgot something
07-14-2013, 01:02 PM
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Where does 3/8 usually have clearance issues ?
My pushrod hole size is around 1/2 " looks like I would have clearance unless pushrod isn't centered on the hole
My pushrod hole size is around 1/2 " looks like I would have clearance unless pushrod isn't centered on the hole
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07-14-2013, 01:09 PM
#8
some might clear just fine but some might rub a tiny bit. sometimes not everything sits 100% perfectly strait in the center of the hole. you can mock them up and then clearance accordingly. Just make sure your not doing any whole opening with the head on the block.
07-14-2013, 01:18 PM
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True that's what I've been seeing
Luck of the draw type thing lol
I've heard the same with thicker wall with 5/16... But I look at it like this if I'm spending $$ anyways mightiest well get the 3/8 .. If I have to drill a little ..that's piece of cake ..
I will post pics when I get the rods
Luck of the draw type thing lol
I've heard the same with thicker wall with 5/16... But I look at it like this if I'm spending $$ anyways mightiest well get the 3/8 .. If I have to drill a little ..that's piece of cake ..
I will post pics when I get the rods
Last edited by zachary3; 07-14-2013 at 01:34 PM.
07-15-2013, 10:48 AM
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was yours doubled tapered or single ?
I was looking into just the straight ones.. but was also looking at the tapered one also
I was looking into just the straight ones.. but was also looking at the tapered one also
Last edited by zachary3; 07-15-2013 at 11:34 AM.
07-15-2013, 04:22 PM
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i agree with OD gets you stiffness no ID or wall thickness
Yes ive seen that also .. and power is carried along abit longer and doesnt drop of like the 5/16th
i seen a comparison with 11/32 to the 5/16 and there was a marginal gain but again power didnt drop off and smoothed out in the higher rpm
i dont know the big technical words but you get the idea....
would the improvements be different Straight vs Double Taper
i was going to order 7.425 length im going to run a Spec cam using EPS Lobes
..but im thinking of waiting to get the cam then measure pushrod length .. atleast thats what my gut says lol ..
Yes ive seen that also .. and power is carried along abit longer and doesnt drop of like the 5/16th
i seen a comparison with 11/32 to the 5/16 and there was a marginal gain but again power didnt drop off and smoothed out in the higher rpm
i dont know the big technical words but you get the idea....
would the improvements be different Straight vs Double Taper
i was going to order 7.425 length im going to run a Spec cam using EPS Lobes
..but im thinking of waiting to get the cam then measure pushrod length .. atleast thats what my gut says lol ..
07-15-2013, 05:30 PM
#18
i agree with OD gets you stiffness no ID or wall thickness
Yes ive seen that also .. and power is carried along abit longer and doesnt drop of like the 5/16th
i seen a comparison with 11/32 to the 5/16 and there was a marginal gain but again power didnt drop off and smoothed out in the higher rpm
i dont know the big technical words but you get the idea....
would the improvements be different Straight vs Double Taper
i was going to order 7.425 length im going to run a Spec cam using EPS Lobes
..but im thinking of waiting to get the cam then measure pushrod length .. atleast thats what my gut says lol ..
Yes ive seen that also .. and power is carried along abit longer and doesnt drop of like the 5/16th
i seen a comparison with 11/32 to the 5/16 and there was a marginal gain but again power didnt drop off and smoothed out in the higher rpm
i dont know the big technical words but you get the idea....
would the improvements be different Straight vs Double Taper
i was going to order 7.425 length im going to run a Spec cam using EPS Lobes
..but im thinking of waiting to get the cam then measure pushrod length .. atleast thats what my gut says lol ..
As for straight vs. double taper, there are two advantages to double taper. First, it allows a stiffer pushrod where the large straight OD won't fit. Second, the harmonics and bend shape is different than a straight pushrod.
07-15-2013, 05:43 PM
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Yes, I have more info if interested. I found the same, the power carried better with about a 6 hp increase. The difference was the curve shape in that it was smoother and carried better.
As for straight vs. double taper, there are two advantages to double taper. First, it allows a stiffer pushrod where the large straight OD won't fit. Second, the harmonics and bend shape is different than a straight pushrod.
As for straight vs. double taper, there are two advantages to double taper. First, it allows a stiffer pushrod where the large straight OD won't fit. Second, the harmonics and bend shape is different than a straight pushrod.
yea i have to resist the urge to buy as all have left is pushrods and other loose ends hopfully if all goes well the engine will finally be in the Iroc end the month or early aug but just order cam and its going to take a month
speaking of which i need to get pushrod length checker today
07-15-2013, 06:01 PM
#20
According to Comp there .105" wall 5/16 pushrod is 17% stiffer than the .080 wall .
http://www.compperformancegroupstore...e=GEN3Pushrods
http://www.compperformancegroupstore...e=GEN3Pushrods