Looking for Input on These Muscle Car Engines
Re: Looking for Input on These Muscle Car Engines
Re: Looking for Input on These Muscle Car Engines
Also, when would be a good time to make the jump to overhead technology and multi-valve technology with these engines from a historical perspective? I'm leaning towards keeping them as pushrods, but I'm just wondering for that.
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Re: Looking for Input on These Muscle Car Engines
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Re: Looking for Input on These Muscle Car Engines
nialloftara wrote:Now this is just my take, but for muscle cars I'd say the cam profile is too aggressive. Only engines like the 426 hemi had torque peak above 4000 rpms, it might cost some hp but try backing off the cam profile till torque peaks between 2000-3500 rpms, that's a more accurate power band. Also remember that those old engines used gross hp ratings where as this game is in net, gross rating is around 20-30% higher than net.
The cam profile is 45 on the standard engines, and 60 on the performance engines. That's low relative to every other engine I've designed, but I've mostly designed high revving small engines with aggressive cam profiles.
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Re: Looking for Input on These Muscle Car Engines
Re: Looking for Input on These Muscle Car Engines
oppositelock wrote:Any reason for the 1955 tech year?
I'm looking for a larger engine for my company. My standard engines come in four different sizes by bore: 60 mm, 75 mm, 90 mm, and 105 mm. The 60 mm designs are direct acting overhead cam inline four and straight six designs for small vehicles. The background for them is that the company started in 1948 with a design for an advanced inline four motorcycle engine and grew from there. The 75 mm designs are direct acting overhead cam as well, but due to technological limitations they don't enter production until the mid-1960s after years of development (they need the 1965 forged connecting rods to handle the RPM). That leaves a gap for more powerful engines to power larger vehicles, with an inline four being ruled out due to the impracticability of having such large engines of that configuration. However, large straight six engines are also ruled out for many applications at that size because they are too long.
Essentially, I need a large V-8 and/or straight six design, likely of a pushrod design. One reason is that the company will be having some headaches getting the larger direct acting overhead cam designs working for the 75 mm designs, and the other will be that pushrods are a conventional design for the period that have better reliability and perform well at lower RPMs. They're also legal in more races.
Muscle cars really didn't hit their stride until the mid to late 60's, using a later tech year would allow you to increase displacement and/or revs to give you the power you're looking for without being unrealistic. I also have to agree about using a smaller cam, those peaky torque curves just aren't right for these types of engines.
1965 and 1970 are big years for my pre-1975 engines.
With the engines having cam settings of 45 (performance) and 60 (sport/super fuel designs), what kind of cam setting do you think would fit? I have some rather aggressive cam ratios on my smaller engines, but they are somewhat niche given their size, role, and history.
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Re: Looking for Input on These Muscle Car Engines
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Re: Looking for Input on These Muscle Car Engines
Re: Looking for Input on These Muscle Car Engines
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Re: Looking for Input on These Muscle Car Engines
Re: Looking for Input on These Muscle Car Engines
oppositelock wrote:With the right mix of cam (44) and ignition (55) I was able to get a nice little torque plateau. It's not ultra powerful, but 200 hp is pretty decent for 1955, and the single four barrel keeps material costs low.
I decided to tune with a lower cam profile to give more torque at lower RPM, so 45 is around the cam profile for my super/sport engine. I'll see if I can incorporate some of this into that design.
Re: Looking for Input on These Muscle Car Engines
Also, when did the transition from pushrods to overhead cam technology start for American automobiles? Obviously it wasn't in the muscle car era, but when would it be appropriate to consider making the change on production engines?
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Re: Looking for Input on These Muscle Car Engines
DeltaForce wrote:Also, when did the transition from pushrods to overhead cam technology start for American automobiles? Obviously it wasn't in the muscle car era, but when would it be appropriate to consider making the change on production engines?
For the American V8, that would be a big, fat, never. . Look at the C7 Corvette, the new Mustang, the Challenger Hellcat. They are all OHV.
Actually, the Big Three have used SOHC and DOHC quite a bit, but I think it was mostly in the late-90s/early-00s era.
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Re: Looking for Input on These Muscle Car Engines
I would put the change to ohc in 4-6 cylinder motors at the mid 80's, when American and Japanese companies started joint projects. Dodge and Mitsubishi, Chevy and Toyota, Ford and Mazda. Each american company gained at least a few OHC engines, and by the late 80's each had developed a in-house sohc or dohc 4 cylinder. Though for ford I think they borrowed more from their European branch.
As for v8's I'd agree somewhere in the 90's with the Cadillac northstar around 92, Ford modular in 96, and eventually Chrysler with the powertech in the early 2000's. That said Chrysler still goes with the pushrod Hemi and GM stays with the iconic small block for all major power and truck applications.
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