Compression Release
Thread Starter
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Outstanding HDF Member
Joined: Oct 2005
Posts: 2,035
Likes: 5
From: near Buffalo, NY
Compression Release
Would it be a good idea to install a set of compression releases in my 95" flat tops w/ 204 cams?
I don't know for sure what compression the 204s build, and the heads are off right now.
Or, is this totally unnecessary?
Thanks..
I don't know for sure what compression the 204s build, and the heads are off right now.
Or, is this totally unnecessary?
Thanks..
Banned
Joined: May 2005
Posts: 14,496
Likes: 156
From:
RE: Compression Release
With the flat tops and 204's I seriously doubt you'll need releases unless you are going with milled heads or thinner head gaskets along with relieved pistons to boost CR. If you have plans to go to a bigger cam, it may be a good idea to get them now while the heads are off, but with the stock flat tops and your cam and stock gaskets, they shouldn't be needed.
Road Captain
Joined: Sep 2005
Posts: 583
Likes: 5
From: Maine
RE: Compression Release
ORIGINAL: George C
Would it be a good idea to install a set of compression releases in my 95" flat tops w/ 204 cams?
I don't know for sure what compression the 204s build, and the heads are off right now.
Or, is this totally unnecessary?
Thanks..
Would it be a good idea to install a set of compression releases in my 95" flat tops w/ 204 cams?
I don't know for sure what compression the 204s build, and the heads are off right now.
Or, is this totally unnecessary?
Thanks..
Thread Starter
|
Outstanding HDF Member
Joined: Oct 2005
Posts: 2,035
Likes: 5
From: near Buffalo, NY
RE: Compression Release
Thanks for the replies..
I was talking to a guy at the gym yesterday, and he said that a buddy of his was having starting issues with his Stage II.
Before this, I never heard of any compression related issues with this mild build. I think his bud may have battery problems instead.
Trust me, if I don't need them, I don't want them.
I was talking to a guy at the gym yesterday, and he said that a buddy of his was having starting issues with his Stage II.
Before this, I never heard of any compression related issues with this mild build. I think his bud may have battery problems instead.
Trust me, if I don't need them, I don't want them.
Road Master
Joined: Jul 2005
Posts: 1,061
Likes: 5
From: Fort Worth TX
RE: Compression Release
WEll A stage should mean something but many times it does not. I have seen where the kit was nothing that the owner was told. I like to install them at the 10.1 range but there are execptions.
Thread Starter
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Outstanding HDF Member
Joined: Oct 2005
Posts: 2,035
Likes: 5
From: near Buffalo, NY
RE: Compression Release
ORIGINAL: HDWRENCH
WEll A stage should mean something but many times it does not. I have seen where the kit was nothing that the owner was told. I like to install them at the 10.1 range but there are execptions.
WEll A stage should mean something but many times it does not. I have seen where the kit was nothing that the owner was told. I like to install them at the 10.1 range but there are execptions.
I'm not sure where you are coming from. Screamin Eagle kits through Harley Davidson leave absolutely no doubt in which parts are involved with the build.
Each Stage is a different selection of parts in kit form, and to suggest otherwise is wrong. In my case, I made a voluntary substitution.
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RE: Compression Release
this may sound dumb,and I have a set installed on my motor just wondering what they are used for. My compression is 10.5 :1
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Novice
Joined: Jan 2006
Posts: 19
Likes: 0
From:
RE: Compression Release
Comp releases are used to lower the compression of the engine on start up with a high compression engine. The higher the compression the harder the starter has to work to turn the engine over and consequently the sooner you burn your starter out. To operate manual comp release, just push the buttons down before you hit the starter. They will bleed some of the intake charge out through the vents in them. When the engine fires they will automatically close and you will be back up to the engines full compression.
Road Master
Joined: Jul 2005
Posts: 1,061
Likes: 5
From: Fort Worth TX
RE: Compression Release
WOW ...... to state that is wrong ok SOOOOOOOOOOOOOOOO is it a stage II 1450, or a 1550II or TQ 1550 those would be carbed now ther are more 1550 stage II that are EFI , with heads or not , and so on. If you look you will find that there are many typ stage II set ups I was speaking in general terms, you really did not state what kit. BUt your question was about compression release. To take a guess I would say that if he is having startin issues and the timing is correct and fuel afr is correct. Then he is most likely in the 10.1 range. Cam intake closing will play a big part in the cranking, not to mention is the battery fully charged?? I am speaking of using a meter and testing it . It needs to 12.8 to be fully charged.
Your setup depending on what gasket the dealer used could be from 9.1 to 9.4 with and that is using 84 cc as a chamber volume you are inthe 8.8 dynamic range and 181 cranking compression. That is using avarage numbers from 100's of previous builds. Chamber volume will vary from one head to another as well as deck height, valve relief volume. I think you get it but No you are fine without them.
Your setup depending on what gasket the dealer used could be from 9.1 to 9.4 with and that is using 84 cc as a chamber volume you are inthe 8.8 dynamic range and 181 cranking compression. That is using avarage numbers from 100's of previous builds. Chamber volume will vary from one head to another as well as deck height, valve relief volume. I think you get it but No you are fine without them.