Go Back  Offshoreonly.com > Technical > General Q & A
possible reversion ? >

possible reversion ?

possible reversion ?

Old 06-08-2009, 08:12 PM
  #1  
Registered
Thread Starter
 
Join Date: Dec 2008
Posts: 22
Default possible reversion ?

I ve got a 383 stroker i just built with comp cams xm276hr roller camshaft in276 [email protected]" lift in.503 ex.510 lobe sep.112 Im also running a set of glm alum. manifolds and risers.The problem im experiencing is sum times when i go to start the engine it will start to crank over and then it locks up. It might do this 2 or 3 times before it starts. Im kinda worried im getting a little water in the cylinders and getting a hydrolic lock. Was wondering if anyone has seen or heard of a similar problem.
powerplay230 is offline  
Old 06-08-2009, 08:23 PM
  #2  
Registered
iTrader: (1)
 
Join Date: Aug 2004
Location: Whitefish Chain - Crosslake, MN
Posts: 408
Default

I had that same cam in my 383 and I didn't have any real reversion issues, but at tear down I did have some evidence of water in the cylinders. I have some minor rust lines in corresponding to where the pistons would have been. I figured it was condensation from the exhaust riser dripping down into the ports. Only had this on one side.

What intake, carb, and heads are you running?
ACrooks69 is offline  
Old 06-08-2009, 08:25 PM
  #3  
Registered
iTrader: (1)
 
Join Date: Aug 2004
Location: Whitefish Chain - Crosslake, MN
Posts: 408
Default

I should add though, I had below swin exhast exit. If you have straight out the back, you quite possibly have a big enough cam to pull water back on a slight slope.
ACrooks69 is offline  
Old 06-08-2009, 08:28 PM
  #4  
Registered
iTrader: (8)
 
Join Date: Nov 2006
Location: Tygart Lake, WV
Posts: 1,141
Default

Originally Posted by powerplay230 View Post
I ve got a 383 stroker i just built with comp cams xm276hr roller camshaft in276 [email protected]" lift in.503 ex.510 lobe sep.112 Im also running a set of glm alum. manifolds and risers.The problem im experiencing is sum times when i go to start the engine it will start to crank over and then it locks up. It might do this 2 or 3 times before it starts. Im kinda worried im getting a little water in the cylinders and getting a hydrolic lock. Was wondering if anyone has seen or heard of a similar problem.
I ran that same cam only with 1.6R on the intake two years ago on a 355ci SBC. I also ran GLM manifolds but with FastGlass Stainless Performance short risers. I had reversion at idle. After 45 secs of idling there would be small puddles of water in the center runners. I had to weld 16" extensions onto my risers to get rid of any reversion. With my current 385ci I run a custom hyd roller 234/240 .580/.568 112+4 and have 22" extensions. The water does not meet the exhaust until inside the tip.

Only way to find out for sure is to idle the engine for a mine and then turn off. Then pull the riser and inspect. It does not sound good when you say locks up. Water does not like being compressed and usually results in a bent rod or worse. HTH
Ryan00TJ is offline  
Old 06-08-2009, 08:48 PM
  #5  
Registered
Thread Starter
 
Join Date: Dec 2008
Posts: 22
Default

Im running vortec heads /edelbrock vortec rpm air gap intake and a edelbrock 600 cfm carb. I thinking about getting a 750 holley.
powerplay230 is offline  
Old 06-08-2009, 09:03 PM
  #6  
Registered
Thread Starter
 
Join Date: Dec 2008
Posts: 22
Default

Its strange it doesnt do it everytime. Another thing ive noticed is i dont have near as much water coming out the exhaust tips as i did with my 355 running comps xm270hr which is the next smaller cam running stock merc exhaust.
powerplay230 is offline  
Old 06-08-2009, 09:46 PM
  #7  
Registered
iTrader: (1)
 
Join Date: Aug 2004
Location: Whitefish Chain - Crosslake, MN
Posts: 408
Default

What RPM are you idling at? Maybe you just need to bump the idle speed up to 800 or 850. I don't think the apparent change in water out the tip has any relation to this.
ACrooks69 is offline  
Old 06-09-2009, 11:14 AM
  #8  
Registered
Thread Starter
 
Join Date: Dec 2008
Posts: 22
Default

I was thinking about hooking up the mouse ears in the drive to see if i can get it to lock up and then pull the plugs to see if there is any water in any of the cyl.
powerplay230 is offline  
Old 06-09-2009, 11:16 AM
  #9  
Registered
Thread Starter
 
Join Date: Dec 2008
Posts: 22
Default

Its idling around 750 to 800 rpm
powerplay230 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


OSO Sponsor
OSO Advertiser
OSO Advertiser

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

OSO Advertiser