New cam! Nice!!!
Cruiser
Joined: Apr 2008
Posts: 138
Likes: 0
From: The Tropics
woodnbow, I have 10.1 pistons as well and I remember somebody seriously advising against the installation of EV27s. He said the high comp and lobe design will blow the top end in no time.
Well I emailed Andrews and Gary Wallace there recommended the EV46 for me... though he didn't say the EV27 will blow the roof. That was almost a year ago and I still haven't gotten the cam! I used to have an EV27 and replaced it with a stocker when once of the lobes were found to have a chip which caused my pushrod to 'wear off' where they meet that caused a lifter tapping sound.
I know a guy with the EV46 and he says he'd rather have the stock cam because the valvetrain noise is killing him. Not much complaints from the EV27 crowd yet but his opinion is the only one I gathered.
Has anyone got a EV27 + 10.1 High Comp pistons?
Well I emailed Andrews and Gary Wallace there recommended the EV46 for me... though he didn't say the EV27 will blow the roof. That was almost a year ago and I still haven't gotten the cam! I used to have an EV27 and replaced it with a stocker when once of the lobes were found to have a chip which caused my pushrod to 'wear off' where they meet that caused a lifter tapping sound.
I know a guy with the EV46 and he says he'd rather have the stock cam because the valvetrain noise is killing him. Not much complaints from the EV27 crowd yet but his opinion is the only one I gathered.
Has anyone got a EV27 + 10.1 High Comp pistons?
Outstanding HDF Member
Joined: Aug 2010
Posts: 3,486
Likes: 6
From: Union,Ms
I have the equivalent of the EV46 in a Crane cam.From what I was told,the EV27 builds too much cranking pressure and is more likely to ping.By the way,I have minimal noise from my cam.
Tourer
Joined: Nov 2007
Posts: 334
Likes: 2
"I know a guy with the EV46 and he says he'd rather have the stock cam because the valvetrain noise is killing him. " I'd rather live with the noise than the 'performance' of the post 90 cams... Andrews does make a cam that more or less duplicates the L-grind from '88-90. My old 89 fxr ran great, really snappy down low and decent power up to 5000.
I'm checking into this fellas, I'd always heard the 27 needs a compression boost to really run best, seems like John at MIACycles and Scott at Hillside both said this. I could be wrong on that...
I'm checking into this fellas, I'd always heard the 27 needs a compression boost to really run best, seems like John at MIACycles and Scott at Hillside both said this. I could be wrong on that...
Tourer
Joined: Apr 2010
Posts: 293
Likes: 7
More cam..... or more power?????
"I know a guy with the EV46 and he says he'd rather have the stock cam because the valvetrain noise is killing him. " I'd rather live with the noise than the 'performance' of the post 90 cams... Andrews does make a cam that more or less duplicates the L-grind from '88-90. My old 89 fxr ran great, really snappy down low and decent power up to 5000.
I'm checking into this fellas, I'd always heard the 27 needs a compression boost to really run best, seems like John at MIACycles and Scott at Hillside both said this. I could be wrong on that...
I'm checking into this fellas, I'd always heard the 27 needs a compression boost to really run best, seems like John at MIACycles and Scott at Hillside both said this. I could be wrong on that...
The stock engine needs a compression boost to run better, so it really does not mean much to say that.
The issue is not whether or not the ev27 can be matched with a higher than stock CR, as it can. It is an issue of how much higher.
Having high cranking pressure is fine with a large overlap cam, as you can reinstate more efficient ignition timing settings as the rpm rise, thereby maximising power, and getting a good return for your effort.
But if the overlap is relatively low, then that may be difficult to do, and you frequently end up working against yourself.
You cannot take a cam designed to boost cranking pressure, and just keep raising the CR in the assumption that it will be better and better, anymore than you can keep increasing the size of the main jet in the belief that you will go faster and faster.
A matched combo is always the best. An ev46 in a 10.5 - 1 may suit better than an ev27 in a 10 - 1. But it all depends. Weight, riding style, it all counts.
It is a pretty big subject, that takes a long time to fully grasp, and even longer to explain.
Cruiser
Joined: Apr 2008
Posts: 138
Likes: 0
From: The Tropics
I used to have an EV27 with stock compression.. no pinging.
Changed to stock cam.. no pinging.
Now with 10.1-1 High Comp.. PINGING!
Some say changing to an EV27 will stop the pinging. Others say changing will blow the top end and my valves.
Changed to stock cam.. no pinging.
Now with 10.1-1 High Comp.. PINGING!
Some say changing to an EV27 will stop the pinging. Others say changing will blow the top end and my valves.
Tourer
Joined: Nov 2007
Posts: 334
Likes: 2
You can get almost any opinion you want... It's the internet!
I am communicating with a couple of cam manufacturers for their recommendations. Also a couple of guys who do head work... I'm after proven bang for my buck. May go the Vthunder route as I've heard good things about them as well. I don't need huge horsepower/torque but I do want this little scooter to run more like Eric Buell envisioned...
Tourer
Joined: Apr 2010
Posts: 293
Likes: 7
Blow your valves.
Seriously, what is that even supposed to mean? It sounds like a mechanical type term ,but is obviously just rubbish.
Same for blow your top end.
Watch out for high flow air filters, cause they will......
"BLOW YOUR VALVES!!!"
Tourer
Joined: Dec 2010
Posts: 333
Likes: 0
From: southern Alberta Canada
96 apeking, to the best of my knowledge pinging is caused by a lack of octane in the fuel, as you increase the compresion of the engine you need more octane in the fuel. a factory motor would be designed to run on say 87 octane, having about 8.5:1 compresion. Changing the camshaft will change where the engine makes power, some cams are good for low rpms some make power at high rpms, they will change how much air gets into the cylinder or when but probably not enough to cause any pinging. Changing the compression ratio in your engine is what caused it, It is bad for the engine and will hurt it, not quite sure how to explain it, but running higher octane fuel should stop it.
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Cruiser
Joined: Nov 2010
Posts: 100
Likes: 0
From: Greenville,NC.
i put the ev27 cam in with 10.5-1 pistons and, S&S superstock heads,runs great, good pull, and have no problem with it turning over cold or hot, had a ping at low RPM to start with when i give it gas, but only run 93 octane in it now and does fine, at frist i still had some of the old gas in it--87 octane
Road Master
Joined: Nov 2007
Posts: 1,152
Likes: 13
From: Southeast WI
I went with the EV46 over the EV27 at the recommendation of my local H-D master rmechanic for my 80" EVO with S&S Super E carb/AC. It is a bit of a hotter cam than the 27 and I have been very happy with my choice. Great performer and no valvetrain noise.