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Author Topic:   backward pistons?
smblk t-bolt
Journeyman

Posts: 93
From: port alberni BC Canada
Registered: Apr 2002

posted 05-15-2002 05:57 PM     Click Here to See the Profile for smblk t-bolt   Click Here to Email smblk t-bolt     Edit/Delete Message   Reply w/Quote
I remembered reading a while ago about installing your piston's backwards in a small block(302 in this case)for more power.I recently found the article in an old magazine and it says the pin is slightly offset and that if you put the notch facing rearward its good for 15-30 horsepower, if you can live with a bit of extra noise.Whats up with this?Is it true, and if so...why havent I read it anywhere else?would it be a time-bomb waiting to happen?also, only good for 289-302 or 351 also?.

thanx, ron

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bfxcomet
Gearhead

Posts: 691
From: Port Alberni, B.C. , Canada
Registered: Mar 2001

posted 05-15-2002 09:06 PM     Click Here to See the Profile for bfxcomet   Click Here to Email bfxcomet     Edit/Delete Message   Reply w/Quote
Hey Ron do you still go for coffee during the day?I'm laidoff so let me know.
If you want I'll give you a good deal on a c4 and no not your old c4.
Roger

------------------

65 comet project
84 T-bird
Made in CANADA built for speed
#1145

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capri man
Gearhead

Posts: 7611
From: doerun, ga.
Registered: Nov 2000

posted 05-15-2002 09:28 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
ron, i have heard the same thing myself. but not from a reliable source. help anyone??

------------------
mike r
racing is real
everything else is just a game.
81 capri-7.56 @88mph 1/8
1.56 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141

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MattN
Journeyman

Posts: 69
From: Mattoon, IL.
Registered: Feb 2002

posted 05-15-2002 09:40 PM     Click Here to See the Profile for MattN   Click Here to Email MattN     Edit/Delete Message   Reply w/Quote
I read the same thing. I think Joe Sherman was the one that built the engine. At least he is the one I remember.

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63fairlane
Journeyman

Posts: 31
From: Bronson,Mich.,USA
Registered: Feb 2002

posted 05-15-2002 11:17 PM     Click Here to See the Profile for 63fairlane   Click Here to Email 63fairlane     Edit/Delete Message   Reply w/Quote
I just got done building that set-up.Haven't fired it up yet as I'm still working on the engine compartment.Closeing up all the little holes.I did this with a Mac-10 cart engine 30yrs.ago.Good torque increase.It's also known as the poor mans stroker.It gives a better rod angle at TDC to the crank.It also increases the velosity of the piston on the exhaust stroke.=higher exhaust gas velosity.The down side is that you get cold start piston slap.Let ya know how it works if and when it lives.

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63 fairlane

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stang106
Gearhead

Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 05-15-2002 11:45 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
I just re-read that article and am quite skeptical of the numbers. If its such a huge horsepower gain (30 hp) for no more cash then why is it not mainstream? I am also skeptical of the big solid cam numbers and yet he uses push-in studs and stock rockers? I would like to hear from those who are familiar with dyno numbers on SBF about this?
Dave

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'70 ragtop Stang
"I live my life 16.090 seconds at a time"

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mustangboy
Gearhead

Posts: 1147
From: Ont, Canada
Registered: Mar 2002

posted 05-16-2002 02:22 AM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
Just wanted to clear a few things up.The cam he uses is a hydraulic Isky Megacam 280H with .517L [email protected] and the stock rockers he uses are the old style (non rail type)which I have used with a slightly bigger cam than that.It also says he uses screw in studs and guideplates.As for the backwards pistons it would depend on the exact piston and how much the pin was offset as to how much power you would gain.He's claiming 15-30 hp. I would imagine the reason its not mainstream is because of the piston slap noise.

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n2oMike
Gearhead

Posts: 2831
From: Spencer, WV
Registered: Jan 2001

posted 05-16-2002 06:54 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Here's the article online...

http://www.jason.fletcher.net/tech/sherman/sherman.htm

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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smblk t-bolt
Journeyman

Posts: 93
From: port alberni BC Canada
Registered: Apr 2002

posted 05-17-2002 02:49 PM     Click Here to See the Profile for smblk t-bolt   Click Here to Email smblk t-bolt     Edit/Delete Message   Reply w/Quote
I used a bigger cam than that originally with roller tip rockers and press in studs..worked fine.Isnt the only problem with press in's related to spring preassure?I'm interested in how 63 fairlanes setup works(I have a 64 fairlane)n20mike..that is the article I was reading..

thanx all for the replies!

ron

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