Bike Talk Motorcycle Forum Bike Talk Motorcycle Forum
Go Back   Bike Talk Motorcycle Forum > The Garage > Motorcycle Tech Talk
Discussion on Compression release within Bike Talk's Motorcycle Tech Talk forum.

Home Forum Register FAQ Sponsorship Search Today's Posts Mark Forums Read

Compression release


Welcome to the Bike Talk motorcycle forum Contact Bike Talk Join Bike Talk

» Site Navigation
 > F.A.Q.
» Auction

» B-T Recommends:
Visit Biker Bids

Harley-Davison Parts & Accessories at RideGear.com


Reply
 
Old May 21st, 2008, 09:37 PM   #1
douglas
Newbie
 
Join Date: May 2008
Location: mayflower,arkansas
Posts: 1
Model: bmc"big daddy" 100in rev-tech
Interests: art(drawing),fishing,riding
Occupation: maint;multicraftsman

feedback on compression release valves for rev-tech 100,suggestions?
douglas is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Sponsored Links
Old May 21st, 2008, 09:59 PM   #2
Art_NJr
200+ posts and climbing
 
Join Date: Mar 2008
Location: North Carolina
Posts: 457
Model: '95, '00 Sportsters
Interests: Land-Speed-Record events
Occupation: Independent contractor (several fields)
View Art_NJr's Gallery
4 Images Posted
Quote:
Originally Posted by douglas View Post
feedback on compression release valves for rev-tech 100,suggestions?
You can get simple "pop-up" ones from Zippers Performance.

I have 'em on my 100" race engine, but even with the (a lot higher than a street bike) compression ratio, if the engine's tuned right & the battery is good, they're not necessary.
Art_NJr is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old May 22nd, 2008, 09:51 AM   #3
jazzhog
Very Active Poster 50+
 
jazzhog's Avatar
 
Join Date: Apr 2008
Location: NY
Posts: 58
Model: FLSTFI
Interests: Praising the lord, Grand kids, Motorcycles & jazz music
Occupation: Auto body & collision tech.
View jazzhog's Gallery
14 Images Posted
Quote:
Originally Posted by douglas View Post
feedback on compression release valves for rev-tech 100,suggestions?

If the engine don't start right up at the first crank, they are worthless. To install them I believe the heads have to come off. Spike make ones that fit with the spark plugs, I don't know how well they do the job. Art-Njr is right if you have a good battery and the scoot is tuned properly you don't need them.

I had them installed on my Fatboy Then had to buy a strong battery anyway.
I bought a big bore 350CCA and it has plenty of power to kick that sucker over. "JAZZ"
jazzhog is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old May 22nd, 2008, 10:59 AM   #4
hotroadking
Has posted 500+
 
hotroadking's Avatar
 
Join Date: Jun 2004
Posts: 1,989
Have you done a compression test on the motor, cold?

Check the PSI and see where you are.


Where you get into starting issues is hot restarts, a high comp (ie over 195 per cyl) motor can kickback hard on restarts especially on hot fl summer days . my 205 psi 95 would start without releases cold every time, stock starter and ring gear.

Hot restarts were a bit tricky had to learn how to start it hot.

But it's not impossible to start, simply stay off the throttle don't twist it to add fuel like you do cold, no gas, no enricher, thumb the starter and let it turn over the motor to clear the cyl and then start.

Typically you can get combustion from the higher pressures and pre-ignition as the fuel enters the combustion chamber and the very hot piston domes then preignition and kick back.

Or if you have lifter bleed down where a valve ends up closing from spring pressure forcing the valve closed on a bleeding lifter, then you are sitting on the wrong part of the cam and the cyl is closed, really cranking up the pressure.

SNS makes travel limiters you put in the lifters JMO a good idea on high comp motors with high lift cams.
hotroadking is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old May 23rd, 2008, 12:20 PM   #5
SkyKing
More than 100 posts!
 
SkyKing's Avatar
 
Join Date: Aug 2004
Location: Boise, ID
Posts: 122
Interests: Keeping Momma Happy
Occupation: Airplane Pilot
There isn't a lot available for the thread size that the RevTech 100 takes. I don't remember who made them, but there is an old thread with the info. You just need to research the old threads a bit. Look back about 3-4 years.
SkyKing is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old May 23rd, 2008, 12:30 PM   #6
SkyKing
More than 100 posts!
 
SkyKing's Avatar
 
Join Date: Aug 2004
Location: Boise, ID
Posts: 122
Interests: Keeping Momma Happy
Occupation: Airplane Pilot
I looked back and came up with this web site:


Sputhe Engineering - Harley Davidson Motorcycles

Rev Tech has 12 mm thread. You will need the 12 mm adapter if you order them.
SkyKing is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Reply

«- N65 Needle « Previous | Next » Gas in the oil -»



Thread Tools



Similar Threads to: Compression release
Thread Thread Starter Forum Replies Last Post
Help Me Choose - Quick Release Super Sport shield vs Standard HellBoy Motorcycle Tech Talk 3 Mar 22nd, 2008 06:44 AM
Compression Windsblow Motorcycle Tech Talk 3 Oct 21st, 2007 07:30 AM
Compression Windsblow Motorcycle Tech Talk 0 Oct 20th, 2007 05:05 PM
Going for compression voodoo1 Motorcycle Tech Talk 5 Apr 9th, 2007 11:09 AM
Compression release Fossilhog Motorcycle Tech Talk 15 Jan 23rd, 2006 01:46 PM

Powered by vBadvanced CMPS v3.0 RC1

All times are GMT -7. The time now is 06:24 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.0.0 RC8
BikeTalk Motorcycle Forum Copyright 1997-2008 all rights reserved


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104