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bygddy 11-09-2012 07:25 PM

Worthwhile upgrade?
 
Went to pick up cam after work today, Dad building the young lads motor with him for an 85 monte and they changed direction to a Turbo motor midway through the build, I went to buy his new XE284 cam, but it turns out it a 292H, with lifters in box brand new, they offered it to me for 150$ as it wasn't the cam the lad thought it was. I told them I would sleep on it and call tommorow....I'm already hearing the 284 was missmatched based on the assumption my little 305 heads don't flow....but it seems the same rules for set up will apply, locked timing etc etc....so is it worth the cash and with 411's and. 3000 stall will it be significantly stronger then the stock converter and wee little lunati I have now? Have to let him know by lunch time tommorow so any input would be appreciated....

hcompton 11-09-2012 07:52 PM

Is it for a 305 a 292h can be a really big cam on the small bore engines. It may also have way too much overlap for most turbo apps.

I love big cams but for small engine its not going to make any power under 3k rpm. Then it will only come alive long enough to run out of flow.

Why 58 cc on a turbo motor. A 2.02 valve head with large chambers would be better. You can always turn up the boost its hard to turn down the compression.

Race car/street car?

ap72 11-09-2012 07:55 PM

I'm not entirely clear on what you are trying to say. Are you asking if you should use the 292H cam or keep what you have?

stock 305 heads can't flow enough to support even a 268xe cam so I wouldn't even consider the 292H, but people have made mismatched engines run okay in the past. If I were you I'd look at a MUCH smaller cam- around 215 duration at .050" if you're running stock 305 heads.

1971BB427 11-09-2012 07:56 PM

Quote:

Originally Posted by hcompton (Post 1609303)
Is it for a 305 a 292h can be a really big cam on the small bore engines. It may also have way too much overlap for most turbo apps.

I love big cams but for small engine its not going to make any power under 3k rpm. Then it will only come alive long enough to run out of flow.

Why 58 cc on a turbo motor. A 2.02 valve head with large chambers would be better. You can always turn up the boost its hard to turn down the compression.

Race car/street car?

I don't think a 2.02" valve head will fit on a 305 block bore. I think a 1.94" might be the largest it will take without notching the block's bore.

hcompton 11-09-2012 08:11 PM

Quote:

Originally Posted by 1971BB427 (Post 1609305)
I don't think a 2.02" valve head will fit on a 305 block bore. I think a 1.94" might be the largest it will take without notching the block's bore.

Yes and no. But if its a 305 your head choice is pretty limited. He didnt say. I was thinking it was for compression. But i guess 85 monte would have 305.

bygddy 11-09-2012 08:28 PM

Sorry for the confusion, 77vette, 350 with stock flattops, heavily ported 416 casting 305 heads, 194/150, performer rpm, 750 dp, 3000 stall, 411 gear...currently has a small lunati 214/224 , 443/465
Heads were ported using any and everything I could find on here from f-bird and he knows his stuff very well. The motor pulls very hard to 6000 as it sits currently. But I will be installing the converter in the spring and wanted more cam at the same time. The price seems really good for the 292 but I know the heads, even worked, aernt ideal, but is it still going to be a large improvement that's worth doing?

bygddy 11-09-2012 08:30 PM

And im getting the cam from a friend who purchased it, then decided against his n/a plan and is going Turbo, so he is selling the 292h new in its box....

1971BB427 11-09-2012 08:33 PM

Quote:

Originally Posted by hcompton (Post 1609315)
Yes and no. But if its a 305 your head choice is pretty limited. He didnt say. I was thinking it was for compression. But i guess 85 monte would have 305.

Guess I didn't see that, just saw you mention a 305 and 2.02" valves, and didn't want people to think they might go together.

hpete 11-09-2012 08:33 PM

I just can't see using a cam with that much overlap on a budget turbo build. You'd be better off with the stocker.

ssimpala 11-09-2012 08:35 PM

That lunati may be the best choice. What's the lsa?

hcompton 11-09-2012 08:39 PM

Yeah better heads would be in order for that cam. Its a much bigger cam than you have right now. 3k stall and compression are good enough to run the cam if the flow is ok it will still make some power but always will be under potential. 210cc intake ports with 2.02 valves would carry you into the 6k rpm alot better. A smaller cam would run alot smoother and still make about the same power in the end.

Dont go to small be aware of the dcr when selecting a cam for that combo compression must be around 11:1. A small cam will make it knock bad with those heads.

ap72 11-09-2012 08:52 PM

Quote:

Originally Posted by F-BIRD'88 (Post 1609335)
The Xe284H-10 is a better cam for your purpose. As far as being a good match to your combo stop
listening to people who no nothing about cams or ported 305 heads.
Don't ask people on the internet how much power you will make. They don;t know.
That what they make dynos and race tracks for.

The 292H magnum is not a bad cam. but....Id rather see you use a better solid lifter cam if you want
to go that big on the cam. It will work a lot better. Don;t be intimidated by street solid lifter cams.
They are not hard ro deal with at all.
Your friend is not the only guy with a cam for sale. You can buy a new cam for $150.
In a hyd the XE284H-10 would have been a good choice.
Yes your ported big valve 305 heads will work very well with it . If you did a decent job on porting them they actually flow pretty good. The only way to know how thye turned out os to run it down the track, stick it on a dyno or flow test the cylinder heads.

You are on your way to a good combo for the street for your vette. Don;t fuggg it all up now.
A Isky Z-27 cam would work very well. #201027. Another cam I like even better for this combo is the Lunati 401A3LUN cam. A nice street solid cam that will run nicer than the comp 292H. You will like it better overall.
good with your ported heads, good wiht the 3/4 shorty headers good with the 3000 stall and 4.11's.



The comp 292H needs a higher stall converter. 3500++.

Thats what I would do if not the Comp XE284H-10 cam. The comp Xe284H-10 cam is the biggest I would go with the 3000 stall converter.


So a hydraulic cam with 244 duration is in the same ballpark as a solid cam with 238 duration? yea right. A comparable hydraulic cam would have about 225 duration which is used with fully ported 305 heads would actually be about right.

So yes, the 401A3LUN cam would be a pretty good match (if the heads are ported)- the 292H cam isn't even close.

BTW, I'm sure F-bird knows this, but for those that don't you can't compare hydraulic and solid cams directly at 0.050" for the fact that solid cams run lash, for your typical .020" lash you need to subtract around 12 degrees to get an equal hydraulic duration- for more lash you subtract more duration for less lash you subtract less.

bygddy 11-09-2012 08:53 PM

Quote:

Originally Posted by F-BIRD'88 (Post 1609335)
The Xe284H-10 is a better cam for your purpose. As far as being a good match to your combo stop
listening to people who no nothing about cams or ported 305 heads.
Don't ask people on the internet how much power you will make. They don;t know.
That what they make dynos and race tracks for.

The 292H magnum is not a bad cam. but....Id rather see you use a better solid lifter cam if you want
to go that big on the cam. It will work a lot better. Don;t be intimidated by street solid lifter cams.
They are not hard ro deal with at all.
Your friend is not the only guy with a cam for sale. You can buy a new cam for $150.
In a hyd the XE284H-10 would have been a good choice.
Yes your ported big valve 305 heads will work very well with it . If you did a decent job on porting them they actually flow pretty good. The only way to know how thye turned out os to run it down the track, stick it on a dyno or flow test the cylinder heads.

You are on your way to a good combo for the street for your vette. Don;t fuggg it all up now.
A Isky Z-27 cam would work very well. #201027. Another cam I like even better for this combo is the Lunati 401A3LUN cam. A nice street solid cam that will run nicer than the comp 292H. You will like it better overall.
good with your ported heads, good wiht the 3/4 shorty headers good with the 3000 stall and 4.11's.



The comp 292H needs a higher stall converter. 3500++.

Thats what I would do if not the Comp XE284H-10 cam. The comp Xe284H-10 cam is the biggest I would go with the 3000 stall converter.

Cam Spec Card :: Lunati Power
272-282 238-248 @.050" .485" .503" 112LSA .020" lash. use a lunati 73943 valve spring.
(the comp 981's will work with this cam if shimed correctly. Ya this matters.)

OK, well you haven't steered me wrong yet so far.....sounds like in this case I should hang on to my cash and look at a better option....think I should start reading up on solid lifter cams......can I use stock length pushrods, stock style long slot rockers...etc etc...

bygddy 11-09-2012 11:03 PM

Well I think due to the budget theme, and lack of knowledge or experience with anything other then hft cams, I will tell the young lad I'm not interested in the 292 but will likely order up the XE284 you had suggested earlier.....for simplicity's sake and cost effectiveness....I picked up a running 350 from a 70's truck this week for pennies, it needs to be rebuilt so i will likely see how far I can take the motor in the car now, including the new cam and maybe some gas in the spring, and start putting together a "real" motor for when this one goes boom.....this way its a slow build when money allows it and keeps the wife happy.....and I'm having way too much fun with the junk I have now for so little cash invested that i can justify a shiny new cam......

hcompton 11-10-2012 06:24 AM

Quote:

Originally Posted by bygddy (Post 1609405)
Well I think due to the budget theme, and lack of knowledge or experience with anything other then hft cams, I will tell the young lad I'm not interested in the 292 but will likely order up the XE284 you had suggested earlier.....for simplicity's sake and cost effectiveness....I picked up a running 350 from a 70's truck this week for pennies, it needs to be rebuilt so i will likely see how far I can take the motor in the car now, including the new cam and maybe some gas in the spring, and start putting together a "real" motor for when this one goes boom.....this way its a slow build when money allows it and keeps the wife happy.....and I'm having way too much fun with the junk I have now for so little cash invested that i can justify a shiny new cam......

Got to agree with the xe 284h but have you also looked at the magun 280h and the 286h cams. More of an old school cam. I like these better the xe cams are good but seem to be harder on the valve train. For roller the xe is very good and roller valve train and lifters take the abuse of the "more power under the curve" sales pitch design a little better. Heavier cars may get more out of the wider power band and be worth the shorter life cycle.

Solid is not really that bad. Many ppl run them on the street. Tight lash cams are easy to live with. Also put up with todays more agressive lobe profiles. For dual pattern extreame lobe profile type cams. Where the valves are opening faster and staying open longer i would think the isk F-bird recommended should be a pretty good choice. Once the valves seat in they dont need to be adjusted very often. Use poly locks and proper valve train for the cams rpm help alot. I herd another member hear mention that the dodge dart was solid lift and most of the owners didnt know it. Plus many a vette cam with solids. They do work well but so do hyd once its all said and done. Now if its a bracket car solid is the best choice for run after run performance.


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