Engine Blueprinting
Engine Blueprinting
(OP)
Can someone explain what the term engine blueprinting really means. I have a vague idea but I'm not really sure.
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RE: Engine Blueprinting
Rod
RE: Engine Blueprinting
R & R = Rod's Right
Larry Meaux (meauxracing@mindspring.com)
Meaux Racing Heads - MaxRace Software
ET_Analyst for DragRacers
http://www.mindspring.com/~meauxracing/
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RE: Engine Blueprinting
RE: Engine Blueprinting
RE: Engine Blueprinting
You miss the point. We are talking about 'bluprinting', not 'hop up'. The term 'bluprinting' (bad choice of word IMHO) refers to maxamizing an engines performance by building to the OEM tolerances that will yield the best performance in whatever venue we are building for. This scheme of 'bluprinting' came about by racing organization's stock engine classes. It is just human nature to use whatever is at hand to go faster in ANY race class. In the case of 'stock' classes, we tended to throw money at it by 'bluprinting' to stock(???) OEM specifications. I am not sure if the origin of this term was from dragracing in the 50's but, I suspect it WAS. As a result of this scheme of 'bluprinting' the cost of racing in 'stock engine' classes has escalated to nearly equal that in fully modified classes. It is a shame that the 'limited modification' classes are not used more extensively as they are much less costly overall. SCCA's 'IT' class and 'Spec Miata' are a couple of very competitive classes that are cost effective. NOTE--I did not say cheap, just cost effective as racing classes go.
As to those demensions you refer too---well that IS old school for sure. My latest racing engine intended for use in the 3750 to 8500 rpm range are 0.0015"mains and 0.001" rods with 0.0015"to 0.002" piston skirt with 5W-30 synthetic. Some of the 'factory' stuff is even tighter. These tighter specs are the result of better machining and mfgr techniques, better lubrication etc. Tighter specs result in a smoother revving engine, less vibration from things moving about I suspect. You will have to talk to Larry Meaux or Greg Locock for confermation or denial of that.
Rod
RE: Engine Blueprinting
I reduced the big end clearances to get a measurable improvement in the sound emitted by the engine. In the end we did it in production by introducing 5 grades of fit in the assembly process. They hated me.
I always wanted to do the mains as well, but had used all my Brownie points up by then.
Skirts is interesting (hmm, yes), we'd love to get a better handle on slap, especially when cold.
Cheers
Greg Locock
RE: Engine Blueprinting
RE: Engine Blueprinting
Where do you work?
I have done limited NVH work but find it interesting.
you mensioned a straight six engine once.
Could you email me please at
rpaul5@jaguar.com?
Thanks
RE: Engine Blueprinting
By the way Rod, re your response in the Oil's section, the name is Pat as in Patrick, and I hail from the land of the Valiant Charger 265 Hemi in line 6.
RE: Engine Blueprinting
Rod
RE: Engine Blueprinting
GregLocock posted on July 5, 2002
Skirts is interesting (hmm, yes), we'd love to get a better handle on slap, especially when cold.
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Greg, have you tried using any of the piston secondary motion simulation tools out there? I think that Ricardo and MDI/ADAMS both have piston secondary motion dynamic simulation software available, and I've heard the software is good for stuff like that...
RE: Engine Blueprinting
However, I do now have MSC ADAMS Engine, so when I find a convenient time slot that'll get a workout. Late 2005 looks good!
In my opinion the ADAMS slover has a generic problem with internal damping (it obviously handles discrete damper fine), so I would expect to find modelling proportional damping rather difficult. On the other hand the kinematics and the collision modelling works very well.
Cheers
Greg Locock
RE: Engine Blueprinting
How does ADAMS model collisions? I have only limited experience (about 100 to 200 hours) with that software, and I'm not clear on all the details. It's been quite a long time since I used it, too.
When you say that you black-box the pistons, you mean that you give some specs to Mahle or Fed. Mogul (or other) and get a complete piston design back, right? I know (based on some previous work with an engine OEM) that some of those guys use Ricardo's PISDYN in-house, although from what I recall, the features of the software are not fully utilized by them.
RE: Engine Blueprinting
I don't know how it models collisions, either. I'll get around to reading more about that in 2006 at the current rate of progress.
Yes, black boxing means we don't know what goes on inside the design, which is frustrating but seems to be the way of the future. The trick is writing an achievable but satisfactory spec, and finding a vendor you trust.
Cheers
Greg Locock
RE: Engine Blueprinting