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  View original topic: Max rpm on a 1776 engine
wellcraft Tue Oct 28, 2014 6:30 pm

I currently have a 1600 but planning on rebuilding the motor next year to 1776 stock, My question as I will be ordering a new tach tonight and need to order the correct one, what's the max rpm's on a 1776 stock engine?

They offer 6k and 8k rpm gauges.

Thanks.

Glenn Tue Oct 28, 2014 6:32 pm

a 1776 is not stock. If you're using all stock internals, then get a 6k.

wellcraft Tue Oct 28, 2014 6:46 pm

Glenn wrote: a 1776 is not stock. If you're using all stock internals, then get a 6k.

Probably I would go with stock internals, but what about if I decide to do some upgrade to get some more hp's?
Knowing me I might end up going for a bit more.

I just would like to get some more hp but at the same time keep a reliable engine.

GTV Tue Oct 28, 2014 6:49 pm

wellcraft wrote:
I just would like to get some more hp but at the same time keep a reliable engine.

Then don't spin it to 8k.

Glenn Tue Oct 28, 2014 6:50 pm

You can buy a 8k tach, but unless you dump a lot of cash into the engine it won't turn 8k.

mcmscott Tue Oct 28, 2014 6:50 pm

I ran a stock crank and rod 1776 to 7500 rpm with no problems.

wellcraft Tue Oct 28, 2014 6:53 pm

No, i'm not looking to spend top dollars for hp, maybe from 40 which is what I believe the car has now to maybe 70 80 hp, would love to have about 90 tho.

Danwvw Tue Oct 28, 2014 6:53 pm

Considering that stock max rpm is something like 4500 RPM and even most performance engines being built for the street are only driven to about 6000 RPM maximum get the 6K Tach for best resolution. To go over 5500 or 6000 rpm your talking some serious up grades.
Even a 6000 rpm engine will need some special valve train components and it would be nice if it had forged Pistons at least. But to get 7000 your going to be talking more of a Race engine than a street engine.

wellcraft Tue Oct 28, 2014 6:57 pm

Thanks guys, iprobably I would go with 6k. But now that im thinking, when I sell my cars I like to keep the aftermarket stuff for my next project and I know this will be one of the thing I would keep. So, might go with the 8k just for that reason.

wellcraft Tue Oct 28, 2014 6:57 pm

Thanks guys, probably I would go with 6k. But now that im thinking, when I sell my cars I like to keep the aftermarket stuff for my next project and I know this will be one of the thing I would keep. So, might go with the 8k just for that reason.

57BLITZ Tue Oct 28, 2014 7:17 pm

What Danwvw is saying about the "best resolution" is that the 6,000rpm gauge will be easier to read than the 8,000 rpm gauge . . . both have the same size for the face bezel, but the graduation (spacing of the numbers) will be greater on the 6,000rpm tach.
In other words, for any given rpm that the engine is spinning, the gauge needle moves farther and for that reason it will be easier to read what number it is pointing at.

Same thing goes for any other gauge . . . a 120mph speedo will be easier to read than a 180mph speedo . . . Pick the 80psi oil pressure gauge rather than a 150psi oil pressure gauge, etc..

Brian Tue Oct 28, 2014 9:44 pm

6k tach? someone link me to a 6k tach, I can only find 8K tachs.

HRVW Tue Oct 28, 2014 10:11 pm

:-k Nothing wrong with a 8K Tach. That's what I have with my 1776 Turbo.

Generally a stock 69mm crank can be used for a 1776 where many would stop at 4500 RPM to be on the save side.

Using a 69CW will allow that max 4500 RPM to go higher.

I can run mine and have many times up to and over 6000 RPM just sittiing still and that is using part throttle but I'm not stupid to find the limits of the engine.

With avg driving there is NO dyer need to go over 6K every time you shift gears unless the person has a lot of money to do any repairs that will occur.

jfats808 Tue Oct 28, 2014 10:22 pm

As mentioned on some, I would do a cw crank, rod, flywheel and p/c set. That increases life and reliability a huge bunch. If you will consider duals, the benefits are better mpg and performance vs stock. Assess your budget. If youre thinking of a cam and nicely priced heads, take a look at tims super stockers. Now theres a sweet 70-80hp. It always comes down to budget.

57BLITZ Tue Oct 28, 2014 11:32 pm

Brian wrote: 6k tach? someone link me to a 6k tach, I can only find 8K tachs.

Here's a few . . . http://www.summitracing.com/search/department/gaug...=Ascending

Not what ya asked for, 7,000rpm, but this one is interesting . . . http://www.vdo-gauges.com/instruments/by-type/prog...p-kit.html

KILLERWATT Wed Oct 29, 2014 7:41 am

The one time I floated my valves was on a 1776...hex bar linkage stuck wide open on my 40idfs.

5500-6000 max depending on dual rev springs and cam. That being said I have an 8k tach now on a motor that rarely sees over 3500.

[email protected] Wed Oct 29, 2014 7:44 am

There is really no good reason to wind a street engine past 5500rpm and that's at shift points.

VDub Rising Wed Oct 29, 2014 10:25 pm

I just built a 1776 with counterweighted internals and I put a 5500 rev rotor in the distributor just to be safe. I don't see the need to go any higher than that. Plus, iv seen guys do serious damage due to stuck throttles so it acts as a safety barrier.

67jason Wed Oct 29, 2014 10:30 pm

wellcraft wrote: I currently have a 1600 but planning on rebuilding the motor next year to 1776 stock, My question as I will be ordering a new tach tonight and need to order the correct one, what's the max rpm's on a 1776 stock engine?

They offer 6k and 8k rpm gauges.

Thanks.


too many variables to consider...max rpm could be 4800 or it could be 8800. just depends on how the motor was set up and what parts were used. most hi-po street engines redline in the 5500-7000 range.



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