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Search found 1979 matches

by Orr89rocz
Thu Jan 26, 2023 7:24 am
Forum: Engine Tech
Topic: Question about boost.
Replies: 21
Views: 676

Re: Question about boost.

I put a small turbo on my bone stock 91 z28 daily driver. I even rear mounted it so i didnt have to mess with the stock engine bay. The ac still worked great and i didnt want to mess with it. All in all id say it made 350 hp. On just 8 psi. Pretty good considering stock 305 tpi makes like 200 and be...
by Orr89rocz
Tue Jan 24, 2023 8:20 am
Forum: Engine Tech
Topic: Cam gurus, I need advice
Replies: 34
Views: 1605

Re: Cam gurus, I need advice

Comp cams advertises that cam for 3,000-6100 rpm. I thought that sounded off myself. I also got the valve springs they recommend for the cam. I've heard several say comp is a little conservative on their spring recommendation on their roller cams. Probably cuz thats where it floats with their springs
by Orr89rocz
Mon Jan 23, 2023 12:51 pm
Forum: Engine Tech
Topic: Question about boost.
Replies: 21
Views: 676

Re: Question about boost.

Theoretically a turbo should be easier on the rod and rod bolts due to higher backpressure in exhaust port on the exhaust stroke when piston goes to tdc. Suppose to act like a cushion, denser air is harder to move thru so piston trying to separate from the rod should encounter more resistance and pu...
by Orr89rocz
Mon Jan 23, 2023 12:46 pm
Forum: Engine Tech
Topic: Cam gurus, I need advice
Replies: 34
Views: 1605

Re: Cam gurus, I need advice

Wont see a big difference in the cams. Nothing noticeable on the street I would run a different valvespring tho imo. A smaller diameter double with 150 seat closer to 375-400 open imo or so. Maybe even 165 seat. Or a conical or beehive, you can get away with less pressure there 242 deg is pretty hot...
by Orr89rocz
Fri Dec 16, 2022 8:39 am
Forum: Engine Tech
Topic: Burn patterns on piston and chamber
Replies: 108
Views: 4275

Re: Burn patterns on piston and chamber

Nothing wrong with whatever scale you use for afr. As long as you know what the values should be. I run e85 but tune on gas scale 14.7 stoich. My afr is in the mid 11’s at max boost and thats where it runs best. Mid 11.5 afr on gas scale is .78 lambda which would equal something like 7.5 afr on e85...
by Orr89rocz
Thu Dec 15, 2022 7:37 am
Forum: Engine Tech
Topic: Burn patterns on piston and chamber
Replies: 108
Views: 4275

Re: Burn patterns on piston and chamber

Nothing wrong with whatever scale you use for afr. As long as you know what the values should be. I run e85 but tune on gas scale 14.7 stoich. My afr is in the mid 11’s at max boost and thats where it runs best. Mid 11.5 afr on gas scale is .78 lambda which would equal something like 7.5 afr on e85 ...
by Orr89rocz
Tue Dec 13, 2022 9:50 pm
Forum: Engine Tech
Topic: Burn patterns on piston and chamber
Replies: 108
Views: 4275

Re: Burn patterns on piston and chamber

Wow now you got me questioning my car. I only had the heads off once since i got it together few yrs back due to lifter failure. Not a ton of run time on it i guess, few short street pulls, mostly street driving and a few dyno hits. I dont if i ever made a track hit or not that yr. But my flat tops ...
by Orr89rocz
Tue Oct 18, 2022 1:06 pm
Forum: Engine Tech
Topic: Is E85 being Phazed out in your area?
Replies: 33
Views: 1759

Re: Is E85 being Phazed out in your area?

A turbo direct injection motor would make the best use of E85. Already pretty knock resistant without it, you could keep the compression fairly high for efficiency and still operate on gasoline but wind the boost up with E85 when it's time to do some work. How come I haven't heard of this happening...
by Orr89rocz
Mon Oct 17, 2022 1:10 pm
Forum: Engine Tech
Topic: Lifter Manufactures And Who Are They
Replies: 59
Views: 12918

Re: Lifter Manufactures And Who Are They

I thought failures were likely due to lack of proper oil and additives. Thought today’s oil just wont work well with flat tappets?
by Orr89rocz
Fri Oct 14, 2022 2:36 pm
Forum: Engine Tech
Topic: Is E85 being Phazed out in your area?
Replies: 33
Views: 1759

Re: Is E85 being Phazed out in your area?

The only thing it was ever good for was cheap race gas. Period. In that "available at the pump" E85 was only 85% ethanol by accident; and it was deliberately manipulated seasonally from about 65% to about 80% ethanol...HOW DO YOU TUNE THE FUEL SYSTEM for fuel that's perpetually changing? Either you...
by Orr89rocz
Thu Oct 13, 2022 8:27 am
Forum: Engine Tech
Topic: Is E85 being Phazed out in your area?
Replies: 33
Views: 1759

Re: Is E85 being Phazed out in your area?

For boosted guys you cant beat e85. Its been phenomenal for me, my bbc turbo made 1832 whp on it lol

When regular was over 4 a gal, i was running e15 in my 17 sierra truck. It was 40-50 cents less then 87. And i didnt seem to notice any mpg difference
by Orr89rocz
Wed Oct 12, 2022 1:57 pm
Forum: Engine Tech
Topic: Is E85 being Phazed out in your area?
Replies: 33
Views: 1759

Re: Is E85 being Phazed out in your area?

Never really looked ... it was only a little less expensive than regular gasoline and a new car used about twice as much. If it was more economical I would have paid more attention. Thats odd, its always been way cheaper than regular here. Like precovid it was like 1.99-2.09 or so. I think regular ...
by Orr89rocz
Wed Oct 12, 2022 7:49 am
Forum: Engine Tech
Topic: Is E85 being Phazed out in your area?
Replies: 33
Views: 1759

Re: Is E85 being Phazed out in your area?

Last couple years we been getting more stations that carry it and even some e15 88 oct pumps. Doesnt appear to be phasing out here in western pa
by Orr89rocz
Fri Sep 30, 2022 12:54 pm
Forum: Engine Tech
Topic: What was Chevrolet thinking ?
Replies: 32
Views: 1885

Re: What was Chevrolet thinking ?

Read on Another forum gm changed to the smaller 208/221 cam after Hotrod showed them it could make same power and idle better and get better mpg. The heads were basically 113 L98’s and the zzz cam was just too big. Not sure why they thought that was a good idea unless it was for chop idle sound
by Orr89rocz
Thu Sep 29, 2022 4:00 pm
Forum: Engine Tech
Topic: From a solid roller to hydraulic roller
Replies: 86
Views: 3109

Re: From a solid roller to hydraulic roller

Yeah i had a 267/272 on a 114 and now a 254/259 on a 109. Granted its a turbo car but street cruise alot. It is heavy at almost 4000 lbs and no overdrive but th400 with 3.00 gear. They make same power basically but the smaller cam feels better and spools sooner but both were streetable and fine in 5...