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Search found 21 matches

by Juho_
Wed Dec 11, 2019 7:10 am
Forum: Engine Tech
Topic: Flat Plane V8 Race Engine - Single Exit Exhaust Question
Replies: 124
Views: 4582

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).
by Juho_
Tue Oct 22, 2019 12:38 am
Forum: Engine Tech
Topic: Bore, Stroke, and block strength
Replies: 42
Views: 1574

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...
by Juho_
Sat Oct 19, 2019 2:55 pm
Forum: Engine Tech
Topic: Bore, Stroke, and block strength
Replies: 42
Views: 1574

Re: Bore, Stroke, and block strength

Yes it is.
Also crank has quite large journals.
by Juho_
Wed Oct 16, 2019 3:04 pm
Forum: Engine Tech
Topic: Welding cylinder head
Replies: 2
Views: 414

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'...
by Juho_
Wed Oct 16, 2019 1:31 pm
Forum: Engine Tech
Topic: Welding cylinder head
Replies: 2
Views: 414

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...
by Juho_
Thu Oct 10, 2019 10:12 am
Forum: Engine Tech
Topic: flywheel to balancer weight proportion- inline 6
Replies: 48
Views: 2112

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...
by Juho_
Sun Sep 29, 2019 12:19 pm
Forum: Show & Tell
Topic: FrankenFerrari engine
Replies: 413
Views: 117250

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. :D
by Juho_
Wed Aug 07, 2019 1:37 pm
Forum: Engine Tech
Topic: flywheel to balancer weight proportion- inline 6
Replies: 48
Views: 2112

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...
by Juho_
Wed Jul 31, 2019 3:15 pm
Forum: Engine Tech
Topic: DOHC camshaft design?
Replies: 9
Views: 666

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...
by Juho_
Wed Jul 31, 2019 12:18 pm
Forum: Engine Tech
Topic: DOHC camshaft design?
Replies: 9
Views: 666

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...
by Juho_
Tue Jul 30, 2019 10:31 am
Forum: Engine Tech
Topic: DOHC camshaft design?
Replies: 9
Views: 666

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 (...
by Juho_
Mon Jul 29, 2019 2:47 pm
Forum: Engine Tech
Topic: DOHC camshaft design?
Replies: 9
Views: 666

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!
by Juho_
Mon Jul 29, 2019 2:10 pm
Forum: Engine Tech
Topic: DOHC camshaft design?
Replies: 9
Views: 666

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 duration. ...
by Juho_
Sun Jul 28, 2019 2:14 am
Forum: Engine Tech
Topic: Dodge 3.6l vvt Saturday airflow project
Replies: 43
Views: 1646

Re: Dodge 3.6l vvt Saturday airflow project

I've used a (free) software called 'Gsf dyno' for a few years. It can be very accurate, if testing is done in similar conditions, same place (flat, straight road/area), known weight (car including driver etc., or atleast don't cause noticeable differences), gear ratio+true tire size, drag coefficien...
by Juho_
Sun Jul 21, 2019 3:14 am
Forum: Engine Tech
Topic: Dodge 3.6l vvt Saturday airflow project
Replies: 43
Views: 1646

Re: Dodge 3.6l vvt Saturday airflow project

You are doing very nice job on your projects! It is just ridiculous how some people just say it's not worth any hp to modify (or fabricate a completely new design) factory air box, even if had a dyno graph showing clear gains.. no matter how crappy design the stock box was. Clearly small things matt...