Search found 23 matches
- Mon Aug 28, 2023 3:10 pm
- Forum: Engine Tech
- Topic: E85 Safe/Max Dynamic Comp Ratio
- Replies: 83
- Views: 90488
Re: E85 Safe/Max Dynamic Comp Ratio
I have no clue what is "the" max compression ratio. Depends a lot of engine design. I've ran about 17:1 compression ratio with small cams , and couldn't break it at wot.. on E85. Dynamic comp wasn't much less than 17:1 - bmw 2.8 liter 24 valve engine. Part throttle and lambda=1 caused exce...
- Sun Dec 20, 2020 3:19 pm
- Forum: Engine Tech
- Topic: E85 and its effects on emissions...NA
- Replies: 4
- Views: 723
Re: E85 and its effects on emissions...NA
E85 should reduce those emissions (CO, HC and NOX), if I remember correctly. Atleast CO and NOX. Catalytic converter (and how far it's located) has the most impact on emissions, if it's bad it'll require ridiculous amount of heat to reduce emissions enough to pass the test (depends on the car, tho. ...
- Wed Dec 11, 2019 7:10 am
- Forum: Engine Tech
- Topic: Flat Plane V8 Race Engine - Single Exit Exhaust Question
- Replies: 126
- Views: 13106
Re: Flat Plane V8 Race Engine - Single Exit Exhaust Question
I found the same thing (collector diameters)
Just got the new version of pipemax.
A lot different compared to 3.98.
Any thoughts?
I'll do some more testing later with more time on the new pipemax and see if I've just had inaccurate value(s).
Just got the new version of pipemax.
A lot different compared to 3.98.
Any thoughts?
I'll do some more testing later with more time on the new pipemax and see if I've just had inaccurate value(s).
- Tue Oct 22, 2019 12:38 am
- Forum: Engine Tech
- Topic: Bore, Stroke, and block strength
- Replies: 42
- Views: 3401
Re: Bore, Stroke, and block strength
Yes the cranks are very strong, but the blocks are known to crack at the water pump area. That is on the smaller bore engines that don't have the cylinder wall splitting problem. All the same it is interesting, to me, that when they went for 300hp/300ft-lb they upped the stroke from 90 to 93.someth...
- Sat Oct 19, 2019 2:55 pm
- Forum: Engine Tech
- Topic: Bore, Stroke, and block strength
- Replies: 42
- Views: 3401
Re: Bore, Stroke, and block strength
Yes it is.
Also crank has quite large journals.
Also crank has quite large journals.
- Wed Oct 16, 2019 3:04 pm
- Forum: Engine Tech
- Topic: Welding cylinder head
- Replies: 2
- Views: 742
Re: Welding cylinder head
Thank you for the reply. I'll see what I can do.. just welding the floor doesn't seem that bad option. There is also the possibility to just fill the seat bore and have the seat and valve sit higher. Didn't even think about such as option earlier.. perhaps I should do some measuring and see if that'...
- Wed Oct 16, 2019 1:31 pm
- Forum: Engine Tech
- Topic: Welding cylinder head
- Replies: 2
- Views: 742
Welding cylinder head
Hey, I'm currently working on a -530 Volvo 8 valve aluminum head (going to my own car for testing purposes). The ports require quite a lot work, exhaust port especially requires welding the floor (stupid shape). I have already welded the combustion chambers and done the 'raw cut' for them. What I ha...
- Thu Oct 10, 2019 10:12 am
- Forum: Engine Tech
- Topic: flywheel to balancer weight proportion- inline 6
- Replies: 48
- Views: 5560
Re: flywheel to balancer weight proportion- inline 6
Wouldn't the heavier crank be better, if thinking about harmonics ? 73lbs crank is quite near the crank I have in my Volvo B6304 engine. Journals are 50/65mm and weight 28kg (~62lbs), capacity being 2922cc. No problems revving more than 8000rpm, flywheel and damper bolts hold-on well, no issues. Tho...
- Sun Sep 29, 2019 12:19 pm
- Forum: Show & Tell
- Topic: FrankenFerrari engine
- Replies: 420
- Views: 161186
Re: FrankenFerrari engine
Your work is simply just amazing.
I've read your whole thread, and it gave me a lot of motivation to just start fabricating stuff without worrying how much work it'll take in the end, or is it even possible.
I've read your whole thread, and it gave me a lot of motivation to just start fabricating stuff without worrying how much work it'll take in the end, or is it even possible.
- Wed Aug 07, 2019 1:37 pm
- Forum: Engine Tech
- Topic: flywheel to balancer weight proportion- inline 6
- Replies: 48
- Views: 5560
Re: flywheel to balancer weight proportion- inline 6
Could the crankshaft mass, journal diameter and crank length (-> bore spacing) have more effect than flywheel and/or damper weights/diameters? Some straight six engines have horrible crank harmonics, that cause problems with oil pump gear's nut (BMW M54B30 atleast, fix is to use Ati super damper and...
- Wed Jul 31, 2019 3:15 pm
- Forum: Engine Tech
- Topic: DOHC camshaft design?
- Replies: 9
- Views: 1493
Re: DOHC camshaft design?
My very optimistic target is to try achieve near 400hp (@ crank) naturally aspirated at some point, but also try how high the engine actually can be revved. Current target is to reach 300hp @ ~7000rpm (stock cams).. which shouldn't be a problem with more work, since the current results are already q...
- Wed Jul 31, 2019 12:18 pm
- Forum: Engine Tech
- Topic: DOHC camshaft design?
- Replies: 9
- Views: 1493
Re: DOHC camshaft design?
36mm is the biggest intake valve, that is possible to fit (with larger seats). But I think 33mm is enough for quite high hp potential (and rpm). Bore is another restriction (valve shrouding), making larger intake valve worth less hp in my opinion. If the bore was something like 86-87mm, I would have...
- Tue Jul 30, 2019 10:31 am
- Forum: Engine Tech
- Topic: DOHC camshaft design?
- Replies: 9
- Views: 1493
Re: DOHC camshaft design?
Yes, they are adjustable independently and I've tried some slightly different timings. Pictures I found from my imgur account (minor changes done to engine, engine bay..mostly just 'cleaning' and added restrictive filters) https://i.imgur.com/DqgNcpj.jpg https://i.imgur.com/gRz30Qc.jpg Intake port (...
- Mon Jul 29, 2019 2:47 pm
- Forum: Engine Tech
- Topic: DOHC camshaft design?
- Replies: 9
- Views: 1493
Re: DOHC camshaft design?
Yes, the cam followers are 32mm at diameter.
I'll go with the specs you recommended, and see how it'll work.
Thank you very much!
I'll go with the specs you recommended, and see how it'll work.
Thank you very much!
- Mon Jul 29, 2019 2:10 pm
- Forum: Engine Tech
- Topic: DOHC camshaft design?
- Replies: 9
- Views: 1493
DOHC camshaft design?
I've been working on my six cylinder Volvo B6304 N/A engine for quite a while now. Still running stock cams (about 208*@0.050" and ~9mm lift) - they are for hydraulic lifters, but I've converted them solid because I rev my engine up to 7500rpm. The valve clearances take away some lift and durat...