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Re: Seeking options - lowering compression on SB 426
[Re: B3422W5]
#3048857
06/08/22 11:22 AM
06/08/22 11:22 AM
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Joined: Aug 2011
Posts: 361
mississippi
lostdog
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enthusiast
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OP
enthusiast
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Posts: 361
mississippi
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My dyslexia kicked in on the original post
I meant it was going to be 12.4 : 1
my bad
It will ONLY see street time and honestly it probably won't get driven too much. I am not opposed to running race gas but if I can avoid it, I will
Thanks guys - all good info! I don't know what your cam is like but I would certainly be conservative on timing and try it out on pump. If it isn't driven often I am not sure I would run E85 but I have no experience with it. Cam is Howards solid roller 277/285 .600/.600 That’s a TON of duration for your compression and small heads. Way more than I would run, even in a very racy combo with those heads We're gonna give it a shot and see what happens
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Re: Seeking options - lowering compression on SB 426
[Re: lostdog]
#3048864
06/08/22 11:39 AM
06/08/22 11:39 AM
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Joined: Mar 2010
Posts: 1,061
Atlanta, GA
mgoblue9798
super stock
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super stock
Joined: Mar 2010
Posts: 1,061
Atlanta, GA
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This is the grudge engine I have been trying to get built over this year and a half.
It’s Hughes’ 360 base 426 stroker kit which in my case will effectively have 14.2:1 CR. However, I now need to drop that to 10:1 or so for pump gas. Yes, I called Hughes to see what they could do about different pistons but let’s just say I want to explore other options
I have trick flow heads which are 60 cc chamber
I’m open to suggestions
Thanks ! New pistons are the only way to drop compression that much without butchering your combo and output. I would not chance having reliefs milled in the pistons that much. Buy new ones and sell the old ones to recoup some of the loss.
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Re: Seeking options - lowering compression on SB 426
[Re: lostdog]
#3048906
06/08/22 01:46 PM
06/08/22 01:46 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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That engine would L O V E E-85 !!!
If that is not an option I would see if 5 CC can come out of the combustion chamber, that will get you closer to 11.5 and with that cam I bet you could run fine on quality pump premium gas.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Seeking options - lowering compression on SB 426
[Re: lostdog]
#3048907
06/08/22 01:54 PM
06/08/22 01:54 PM
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Joined: Jan 2003
Posts: 4,395
The Pale Blue Dot
Skeptic
master
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master
Joined: Jan 2003
Posts: 4,395
The Pale Blue Dot
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My dyslexia kicked in on the original post
I meant it was going to be 12.4 : 1
my bad
It will ONLY see street time and honestly it probably won't get driven too much. I am not opposed to running race gas but if I can avoid it, I will
Thanks guys - all good info! I don't know what your cam is like but I would certainly be conservative on timing and try it out on pump. If it isn't driven often I am not sure I would run E85 but I have no experience with it. Cam is Howards solid roller 277/285 .600/.600 That cam's duration @.050 is 245/253 The shelf cam is on a 108 Cl, they offer one at 112 as well. Howards cam specs
Last edited by Skeptic; 06/08/22 01:56 PM.
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Re: Seeking options - lowering compression on SB 426
[Re: krautrock]
#3048924
06/08/22 03:23 PM
06/08/22 03:23 PM
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Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
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If you're really "only 12.5:1 with that cam you're going to need at least 50:50 race gas but if the car is really light and has a deep gear and a loose converter you can probably run it on the street if you put in an MSD dash mount spark retard. I wouldn't go WOT with pump 93 tho. What intake are you running? If your manifold cant outflow your heads it will kill power and may it more prone to spark-knock. A 3 1/2" is will raise the torque and HP curves, a 3" will lower the peak torque rpm and also the rate of rise of the HP trajectory
Last edited by Streetwize; 06/08/22 03:29 PM.
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Re: Seeking options - lowering compression on SB 426
[Re: Streetwize]
#3048980
06/08/22 07:32 PM
06/08/22 07:32 PM
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Joined: Aug 2011
Posts: 361
mississippi
lostdog
OP
enthusiast
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OP
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mississippi
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If you're really "only 12.5:1 with that cam you're going to need at least 50:50 race gas but if the car is really light and has a deep gear and a loose converter you can probably run it on the street if you put in an MSD dash mount spark retard. I wouldn't go WOT with pump 93 tho. What intake are you running? If your manifold cant outflow your heads it will kill power and may it more prone to spark-knock. A 3 1/2" is will raise the torque and HP curves, a 3" will lower the peak torque rpm and also the rate of rise of the HP trajectory
Trick flow heads and intake
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Re: Seeking options - lowering compression on SB 426
[Re: Streetwize]
#3048981
06/08/22 07:32 PM
06/08/22 07:32 PM
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Joined: Aug 2011
Posts: 361
mississippi
lostdog
OP
enthusiast
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OP
enthusiast
Joined: Aug 2011
Posts: 361
mississippi
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If you're really "only 12.5:1 with that cam you're going to need at least 50:50 race gas but if the car is really light and has a deep gear and a loose converter you can probably run it on the street if you put in an MSD dash mount spark retard. I wouldn't go WOT with pump 93 tho. What intake are you running? If your manifold cant outflow your heads it will kill power and may it more prone to spark-knock. A 3 1/2" is will raise the torque and HP curves, a 3" will lower the peak torque rpm and also the rate of rise of the HP trajectory
I am not opposed to making fuel cocktails !
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Re: Seeking options - lowering compression on SB 426
[Re: lostdog]
#3048987
06/08/22 07:55 PM
06/08/22 07:55 PM
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Joined: Mar 2005
Posts: 3,021
NY
B1duster
master
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master
Joined: Mar 2005
Posts: 3,021
NY
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Re: Seeking options - lowering compression on SB 426
[Re: Streetwize]
#3049020
06/08/22 09:40 PM
06/08/22 09:40 PM
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Joined: Aug 2011
Posts: 361
mississippi
lostdog
OP
enthusiast
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OP
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mississippi
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If you're really "only 12.5:1 with that cam you're going to need at least 50:50 race gas but if the car is really light and has a deep gear and a loose converter you can probably run it on the street if you put in an MSD dash mount spark retard. I wouldn't go WOT with pump 93 tho. What intake are you running? If your manifold cant outflow your heads it will kill power and may it more prone to spark-knock. A 3 1/2" is will raise the torque and HP curves, a 3" will lower the peak torque rpm and also the rate of rise of the HP trajectory
Going in an all steel full interior ‘70 Duster with shift enhanced 727 , 3.91 gear I haven’t decided on converter yet but I think my notes say I need like 3800 stall.
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Re: Seeking options - lowering compression on SB 426
[Re: lostdog]
#3049033
06/08/22 11:20 PM
06/08/22 11:20 PM
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Joined: Jan 2003
Posts: 11,711
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,711
Portage,michigan
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If you're really "only 12.5:1 with that cam you're going to need at least 50:50 race gas but if the car is really light and has a deep gear and a loose converter you can probably run it on the street if you put in an MSD dash mount spark retard. I wouldn't go WOT with pump 93 tho. What intake are you running? If your manifold cant outflow your heads it will kill power and may it more prone to spark-knock. A 3 1/2" is will raise the torque and HP curves, a 3" will lower the peak torque rpm and also the rate of rise of the HP trajectory
Going in an all steel full interior ‘70 Duster with shift enhanced 727 , 3.91 gear I haven’t decided on converter yet but I think my notes say I need like 3800 stall. I can confidently say that any serious small block is going to want way more than a 3800 flash convertor to go it’s fastest.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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