Have done a went a couple different ways for my NA engines I builds for pulling. The first I did was a heart shaped combustion plate between the block and head. The rest were a dished piston with valve reliefs.
Scott
Search found 59 matches
- Fri Nov 18, 2022 3:00 pm
- Forum: Engine Tech
- Topic: Modify Diesel head for Gasoline?
- Replies: 5
- Views: 636
- Tue Sep 27, 2022 8:51 am
- Forum: Engine Tech
- Topic: Surface gap spark plugs
- Replies: 22
- Views: 8742
Re: Surface gap spark plugs
Ran them in a high compression 17-17.5:1, all iron(block and head no water), alcohol, NA, MFI, pulling I6 based on what NGK recommended for this application. Seemed to work ok, this was a while ago but as I recall they were expensive plugs.
- Fri Sep 02, 2022 11:55 am
- Forum: Engine Tech
- Topic: SBF 347 Carb/TBI Intake Selection
- Replies: 6
- Views: 550
Re: SBF 347 Carb/TBI Intake Selection
I have a 331 with AFR 205's with simular duration on a SR but 110LSA, .664in /.633ex lift, it loves the super victor, In fact when replaced with a performance products version of the victor Jr the low end driveablity improved. I do run a manual with 4.56 with simular weight turning to 8K.
Scott
Scott
- Fri Apr 22, 2022 12:37 pm
- Forum: Engine Tech
- Topic: Anyone here running a solid lift roller cam on a street car?
- Replies: 46
- Views: 4619
Re: Anyone here running a solid lift roller cam on a street car?
10 years with SBF 331cid +.650" lift, 250ish @ .50 duration. Like said no bypass oil filter, it gets reved upon start up until up to temp. It's down right now as I had a rattle in the lower end, apparently a cracked Eagle crank, excessive cam end play which went together that way. 6-8K miles, 1...
- Tue Nov 23, 2021 7:50 am
- Forum: Engine Tech
- Topic: building horsepower on 87 octane
- Replies: 79
- Views: 14812
Re: building horsepower on 87 octane
No but I just did a tractor engine with a mirrored chamber 9:1 comp, .6" lift cam, with a stock carb it is 30% more hp and just sips the fuel on 87 octane. I am intrigued by the symmetric dish.
Scott
Scott
- Thu Oct 14, 2021 8:35 pm
- Forum: Engine Tech
- Topic: Unique Engine – More Power Needed
- Replies: 27
- Views: 4189
Re: Unique Engine – More Power Needed
Can't comment on Pipemax. But I am familiar with that head and you are on the right track with valve size. That port in a filled water jacket configuration can flow easily 370cfm. My only comment is it needs more stroke...just under 5". Oil galleys may need to be relocated
- Sat Mar 27, 2021 7:58 am
- Forum: Engine Tech
- Topic: Do roller tip rockers actually rotate
- Replies: 22
- Views: 2245
Re: Do roller tip rockers actually rotate
This was copied off a NASCAR rocker for our tractor program. To keep things simple out of 8620 steel. We were .860 lift with no issues with longevity.
- Tue Dec 22, 2020 9:21 pm
- Forum: Engine Tech
- Topic: Will AFR185s really add 60 HP?
- Replies: 7
- Views: 1847
Re: Will AFR185s really add 60 HP?
I assume your talking at the crank hp? Put a solid roller with another .1 lift, a super victor intake and have pro systems or a carb builder of your choice build you a 780cfm carb I bet you would pick up 100. I'm making 470rwhp out of my 331, 10.2:1 with AFR 205's, do the math that is well over 500 ...
- Sun Dec 20, 2020 9:57 am
- Forum: Engine Tech
- Topic: 20th century manifold reconfigured for 21st century
- Replies: 32
- Views: 3938
Re: 20th century manifold reconfigured for 21st century
I wanted to share my results of the split manifold test I performed. It was unsuccessful. The first attempts were to small at 1 1/8" &1 1/4", based on sound and area calculations to the 2-1/16" single. So I tried 1-1/2" 1-3/4" and just let them terminate wherever. Could ...
- Thu Nov 12, 2020 9:37 am
- Forum: Engine Tech
- Topic: I6 header or header(s)? 6-1 or 6-2
- Replies: 23
- Views: 6323
Re: I6 header or header(s)? 6-1 or 6-2
This may be application specific, but the best header commercially sold for my Jeep 4.0 is the arh 6:1. Here’s a pic of mine. It also uses the rotational firing mentioned by others. https://i.imgur.com/zPKcMUn.jpg The next best header is a 6:2:1 design and doesn’t make near the power the arh does. ...
- Mon Nov 09, 2020 8:07 pm
- Forum: Engine Tech
- Topic: I6 header or header(s)? 6-1 or 6-2
- Replies: 23
- Views: 6323
Re: I6 header or header(s)? 6-1 or 6-2
How about a vertical exhaust? This was me and my dads former pulling tractor. This was a Burns Stainless 6x1 1-5/8" dia primary tubes, the primary configuration followed the firing order in a circular pattern.
- Sun Nov 08, 2020 8:39 am
- Forum: Engine Tech
- Topic: 20th century manifold reconfigured for 21st century
- Replies: 32
- Views: 3938
Re: 20th century manifold reconfigured for 21st century
Update on the exhaust turning. It didn't like the small one at all down 10hp. The largest one I built was only down about 2-3hp, but looking for gains. I'm going to try the larger pipes which I don't have collects for ranging from 1-1/2 to 2".
- Thu Nov 05, 2020 8:11 am
- Forum: Engine Tech
- Topic: 20th century manifold reconfigured for 21st century
- Replies: 32
- Views: 3938
Re: 20th century manifold reconfigured for 21st century
Some videos:
A walk around after start up:
[https://youtu.be/gIsZpQWs_ao
]
Dyno pull at full load, 1800 rpm
https://youtu.be/VbhPrj3Si5g
A walk around after start up:
[https://youtu.be/gIsZpQWs_ao
]
Dyno pull at full load, 1800 rpm
https://youtu.be/VbhPrj3Si5g
- Wed Nov 04, 2020 7:43 am
- Forum: Engine Tech
- Topic: 20th century manifold reconfigured for 21st century
- Replies: 32
- Views: 3938
Re: 20th century manifold reconfigured for 21st century
Thanks Harry! I go back and fourth if the pipes are to small. The one is 1-1/8 od 12-14" in length that step into a 1.5" collector. The other 3 are 1-1/4 od 12-14" in length that step into a 1.5 or 1.75" collector. My carb is only 1-1/8 and red line rpm is 1800. So we will see I ...
- Tue Nov 03, 2020 8:37 am
- Forum: Engine Tech
- Topic: 20th century manifold reconfigured for 21st century
- Replies: 32
- Views: 3938
Re: 20th century manifold reconfigured for 21st century
So a update engine is built and broke in, it made 90pto hp @1800rpm, factory was 75pto hp with a larger carb at 2300rpm. I have my manifold design to try next here are my prototypes to try. The temperatures are from the dyno at full load on a cool day, it was 48 degrees F air temperature.