Lamey Timing Curve Needed

[Project Ski]

What timing are you guys running on your Lamey's

6mm stroke
85mm Flat Tops
DASA Lenzi Porting
Facotry B Pipe
Dual 46's
ADA Flat Top domes 205 PSI on Pump Gas

 

[Project Ski]

nobody runs MSd or Advent on their Lamey?

 

[freestylegeek]

My current curve is:

28º static
5000 RPM start retard
8250 Rev limit
15º total timing removal

That's on a 8mm x 81.5mm Lamey, non PV, with 190 psi flat-top Kawasaki pistons.

 

[norcal ex]

you running race gas with that?

 

[freestylegeek]

you running race gas with that?

No, pump gas - 93 octane.
My squish is 0.050" and my squish band is 11.5 mm.

 

[norcal ex]

That seems like pretty aggressive timing for an 8mil stroker and no race gas....hmmm

 

[waterfreak]

start at 30 degrees static.

 

[Project Ski]

30 degrees static and then what?

 

[Project Ski]

freestylegeek. you think your timing curve would be safe for my engine. 85mm flat tops. I dropped down to 175PSI

 

[waxhead]

you can get more low end out of it by running a higher static timing

 

[freestylegeek]

freestylegeek. you think your timing curve would be safe for my engine. 85mm flat tops. I dropped down to 175PSI

Yes. I think with your lower compression you could get by with a higher static timing (like Waxhead said). Probably 30º. Do you know what your squish clearance is and what the squish ratio is?

 

[Big Kahuna]

hey Matt, did you ever get your gremlins worked out?

 

[Project Ski]

squish is .050

 

[freestylegeek]

squish is .050

Depending on your ratio, you are probably good to go to 30º static timing.

Have you talked to an engine builder yet? Maybe see what Dan (Lamey) recomends? I'd STRONGLY recomend talking to the Xscream fellas, but if you do that, Chuckie might have you change a couple things...But it will run sweet!

 

[Project Ski]

The problem is, any builder i talk to just wants to cover themselves. I can understand where they are coming from but it ends up giving me very little info.

Unless they build the engine or have it in front of them on a dyno they refer to the... too many variables to even get you started.

I spoke to Dan Lamey. he suggested 24 degrees to 5000rpm and then pull it at 3 per 1000. I tried to get a little more into the setup and into some questions with him but he wanted no part of the convo.


Is there a good thread or forumla i can use to calculae my squish ratio? did a search but didnt find too much on how to calculate. I am runnign ADA head with flat top 30cc domes. i think they have a 4 degree squish relief. Kawi pistons which i think have a 2 degree dome.

 

[freestylegeek]

The problem is, any builder i talk to just wants to cover themselves. I can understand where they are coming from but it ends up giving me very little info.

Unless they build the engine or have it in front of them on a dyno they refer to the... too many variables to even get you started.

I spoke to Dan Lamey. he suggested 24 degrees to 5000rpm and then pull it at 3 per 1000. I tried to get a little more into the setup and into some questions with him but he wanted no part of the convo.


Is there a good thread or forumla i can use to calculae my squish ratio? did a search but didnt find too much on how to calculate. I am runnign ADA head with flat top 30cc domes. i think they have a 4 degree squish relief. Kawi pistons which i think have a 2 degree dome.

I understand.

Squish ratio is the ratio of the piston surface area to the squish surface area.
Example:
I have an 81.5mm bore. The width of my squish band is 12mm.
Piston surface area (approximate) PI*(40.75)^2 = 5217 mm^2
Squish area PI*(40.75)^2 - PI*(40.75 - 12)^2 = 2621 mm^2
So, my squish ratio is 100*(2621/5217) = 50.2%

Did I loose you?

 

[Project Ski]

nope im right with you. I figured that was it but wasnt sure if it was surface area or volume since squish is volumetric.

I have to get a measurement on how wide my squish band is. Thanks for all teh help freestylegeek

 

[waxhead]

i would be going for 32 degrees if it was my engine
but i said that ages ago

 

[wsuwrhr]

What part of this doesn't make sense to you? I personally heard his side of the conversation while on the phone with you and he said he just couldn't give you exactly what you need. Your questions have no cut and dry answers.

If he gives you a curve to use "based on your information" and your information turns out to be inaccurate and your motor blows up or seizes,
who you will hold responsible for that? Yourself? Doubtful.

Not very cool to be so critical to the help Dan did give you. The guy is running ragged most of the time, it is very difficult to get him on the phone to begin with.

... too many variables to even get you started.

I spoke to Dan Lamey. he suggested 24 degrees to 5000rpm and then pull it at 3 per 1000. I tried to get a little more into the setup and into some questions with him but he wanted no part of the convo.

 

[Scorn800]

The problem is, any builder i talk to just wants to cover themselves. I can understand where they are coming from but it ends up giving me very little info.
Unless they build the engine or have it in front of them on a dyno they refer to the... too many variables to even get you started.

I spoke to Dan Lamey. he suggested 24 degrees to 5000rpm and then pull it at 3 per 1000. I tried to get a little more into the setup and into some questions with him but he wanted no part of the convo.


Is there a good thread or forumla i can use to calculae my squish ratio? did a search but didnt find too much on how to calculate. I am runnign ADA head with flat top 30cc domes. i think they have a 4 degree squish relief. Kawi pistons which i think have a 2 degree dome.

Not for nothing but do you blame them. Why should they give out free info?
Who did you buy this motor from? didn't they give you any info on set up?